diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
new file mode 100644
index 00000000..471554fd
--- /dev/null
+++ b/.github/CONTRIBUTING.md
@@ -0,0 +1,8 @@
+# Welcome to the contribution guide for Grist!
+
+You are eager to contribute to Grist? That's awesome! See below some contributions you can make:
+- [translate](/documentation/translate.md)
+- [write tutorials and user documentation](https://github.com/gristlabs/grist-help)
+- [develop](/documentation/develop.md)
+- [report issues or suggest enhancement](https://github.com/gristlabs/grist-core/issues/new)
+
diff --git a/app/client/widgets/ChoiceEditor.js b/app/client/widgets/ChoiceEditor.js
index 85f4facb..1e7aef72 100644
--- a/app/client/widgets/ChoiceEditor.js
+++ b/app/client/widgets/ChoiceEditor.js
@@ -7,9 +7,10 @@ const {ACIndexImpl, buildHighlightedDom} = require('app/client/lib/ACIndex');
 const {ChoiceItem, cssChoiceList, cssMatchText, cssPlusButton,
        cssPlusIcon} = require('app/client/widgets/ChoiceListEditor');
 const {menuCssClass} = require('app/client/ui2018/menus');
-const {testId} = require('app/client/ui2018/cssVars');
+const {testId, colors} = require('app/client/ui2018/cssVars');
 const {choiceToken, cssChoiceACItem} = require('app/client/widgets/ChoiceToken');
-const {dom} = require('grainjs');
+const {dom, styled} = require('grainjs');
+const {icon} = require('../ui2018/icons');
 
 /**
  * ChoiceEditor - TextEditor with a dropdown for possible choices.
@@ -19,7 +20,10 @@ function ChoiceEditor(options) {
 
   this.choices = options.field.widgetOptionsJson.peek().choices || [];
   this.choiceOptions = options.field.widgetOptionsJson.peek().choiceOptions || {};
-
+  if (!options.readonly && options.field.viewSection().parentKey() === "single") {
+    this.cellEditorDiv.classList.add(cssChoiceEditor.className);
+    this.cellEditorDiv.appendChild(cssChoiceEditIcon('Dropdown'));
+  }
   // Whether to include a button to show a new choice.
   // TODO: Disable when the user cannot change column configuration.
   this.enableAddNew = true;
@@ -107,4 +111,18 @@ ChoiceEditor.prototype.maybeShowAddNew = function(result, text) {
   return result;
 }
 
+const cssChoiceEditIcon = styled(icon, `
+  background-color: ${colors.slate};
+  position: absolute;
+  top: 0;
+  left: 0;
+  margin: 3px 3px 0 3px;
+`);
+
+const cssChoiceEditor = styled('div', `
+  & > .celleditor_text_editor, & > .celleditor_content_measure {
+    padding-left: 18px;
+  }
+`);
+
 module.exports = ChoiceEditor;
diff --git a/app/client/widgets/ChoiceTextBox.ts b/app/client/widgets/ChoiceTextBox.ts
index e8635d70..558328fc 100644
--- a/app/client/widgets/ChoiceTextBox.ts
+++ b/app/client/widgets/ChoiceTextBox.ts
@@ -4,7 +4,8 @@ import {ViewFieldRec} from 'app/client/models/entities/ViewFieldRec';
 import {KoSaveableObservable} from 'app/client/models/modelUtil';
 import {Style} from 'app/client/models/Styles';
 import {cssLabel, cssRow} from 'app/client/ui/RightPanelStyles';
-import {testId} from 'app/client/ui2018/cssVars';
+import {colors, testId} from 'app/client/ui2018/cssVars';
+import {icon} from 'app/client/ui2018/icons';
 import {ChoiceListEntry} from 'app/client/widgets/ChoiceListEntry';
 import {choiceToken, DEFAULT_FILL_COLOR, DEFAULT_TEXT_COLOR} from 'app/client/widgets/ChoiceToken';
 import {NTextBox} from 'app/client/widgets/NTextBox';
@@ -45,9 +46,13 @@ export class ChoiceTextBox extends NTextBox {
 
   public buildDom(row: DataRowModel) {
     const value = row.cells[this.field.colId()];
+    const isSingle = this.field.viewSection().parentKey() === "single";
+    const maybeDropDownCssChoiceEditIcon = isSingle ? cssChoiceEditIcon('Dropdown') : null;
+
     return cssChoiceField(
       cssChoiceTextWrapper(
         dom.style('justify-content', (use) => use(this.alignment) === 'right' ? 'flex-end' : use(this.alignment)),
+        maybeDropDownCssChoiceEditIcon,
         dom.domComputed((use) => {
           if (this.isDisposed() || use(row._isAddRow)) { return null; }
 
@@ -150,3 +155,9 @@ const cssChoiceText = styled('div', `
   height: min-content;
   line-height: 16px;
 `);
+
+const cssChoiceEditIcon = styled(icon, `
+  background-color: ${colors.slate};
+  display: block;
+  height: inherit;
+`);
diff --git a/app/client/widgets/TextEditor.js b/app/client/widgets/TextEditor.js
index 0dee97d4..593317c4 100644
--- a/app/client/widgets/TextEditor.js
+++ b/app/client/widgets/TextEditor.js
@@ -39,7 +39,7 @@ function TextEditor(options) {
 
   this.dom = dom('div.default_editor',
     kd.toggleClass("readonly_editor", options.readonly),
-    dom('div.celleditor_cursor_editor', dom.testId('TextEditor_editor'),
+    this.cellEditorDiv = dom('div.celleditor_cursor_editor', dom.testId('TextEditor_editor'),
       testId('widget-text-editor'),   // new-style testId matches NTextEditor, for more uniform tests.
       this.contentSizer = dom('div.celleditor_content_measure'),
       this.textInput = dom('textarea.celleditor_text_editor',
diff --git a/buildtools/build.sh b/buildtools/build.sh
index 0571eaa5..c87643a6 100755
--- a/buildtools/build.sh
+++ b/buildtools/build.sh
@@ -3,7 +3,6 @@
 set -e
 
 PROJECT=""
-export GRIST_EXT=stubs
 if [[ -e ext/app ]]; then
   PROJECT="tsconfig-ext.json"
 fi
diff --git a/documentation/develop.md b/documentation/develop.md
new file mode 100644
index 00000000..56f12c1b
--- /dev/null
+++ b/documentation/develop.md
@@ -0,0 +1,134 @@
+# Development
+
+Please as a first start, tell the community about your intent to develop a feature or fix a bug. Search for the associated issue if it exists or open one with steps to reproduce (for bugs) or a [user story](https://en.wikipedia.org/wiki/User_story#Principle) (for features).
+
+## Setup
+
+### Prerequisites
+
+To setup your environment, you would need to install the following dependencies:
+ - git
+ - [nvm](https://github.com/nvm-sh/nvm/blob/master/README.md) (recommended) or nodejs installed on your system
+ - Chromium to run the end-to-end tests
+ - Python (preferably Python 3.9) and virtualenv
+    - :warning: As of 2023-06-06, Python 3.11 is not supported due to the version of the [wrapt dependency](https://github.com/GrahamDumpleton/wrapt/issues/196)
+
+### Clone the repository
+
+```bash
+$ git clone https://github.com/gristlabs/grist-core
+```
+
+And then, enter the grist-core root directory:
+
+```bash
+$ cd grist-core/
+```
+
+### Setup nodejs
+
+#### Using nvm (recommanded)
+
+You need to install the supported nodejs version as well as yarn. To do so, in the grist-core root directory, run the following command to install nodejs via nvm:
+
+```bash
+$ nvm install
+```
+
+Now check that node is installed in the version specified in the `.nvmrc` file:
+
+```bash
+$ node --version
+```
+
+Then install yarn (the `-g` flag here means that yarn will be available globally):
+```bash
+$ npm install -g yarn
+```
+
+Now each time you want to load nodejs and yarn in your environment, just run the following command at grist-core root directory:
+
+```bash
+$ nvm use
+```
+
+#### Using nodejs
+
+You can also use nodejs installed in your system. To prevent incompatibilities, ensure that the `node --version` command reports a version equal or greater to the one in `.nvmrc`.
+
+### Install the python packages
+
+Be sure to have Python and virtualenv installed. On debian-based Linux distributions, you can simply run the following command as root:
+
+```bash
+# apt install python3.9 python3.9-venv
+```
+
+### Install the project dependencies and build
+
+First install the nodejs dependencies:
+
+```bash
+$ yarn install
+```
+
+Then prepare the virtual environment with all the python dependencies:
+
+```bash
+$ yarn install:python
+```
+
+Finally run this to do an initial build:
+
+```bash
+$ yarn run build:prod
+```
+
+## Start the server in development mode
+
+Just run the following command:
+```bash
+$ yarn start
+```
+
+Each time you change something, just reload the webpage in your browser.
+
+Happy coding!
+
+### Pick an issue
+
+Lost on what you can do to help? If you are new to Grist, you may just pick one of the issues labelled `good first issue`:
+
+https://github.com/gristlabs/grist-core/labels/good%20first%20issue
+
+## Debug the server
+
+You can debug the NodeJS application using this command:
+
+```bash
+$ yarn start:debug
+```
+
+And start using your nodejs debugger client (like the Chrome Devtools). See https://nodejs.org/en/docs/guides/debugging-getting-started#inspector-clients
+
+## Run tests
+
+You may run the tests using one of these commands:
+ - `yarn test` to run all the tests
+ - `yarn test:smoke` to run the minimal test checking Grist can open, create and edit a document
+ - `yarn test:nbrowser` to run the end-to-end tests
+ - `yarn test:client` to run the tests for the client libraries
+ - `yarn test:common` to run the tests for the common libraries shared between the client and the server
+ - `yarn test:server` to run the backend tests
+ - `yarn test:docker` to run some end-to-end tests under docker
+ - `yarn test:python` to run the data engine tests
+
+## Develop widgets
+
+Check out this repository: https://github.com/gristlabs/grist-widget#readme
+
+## Documentation
+
+Some documentation to help you starting developing:
+ - [Grainjs](https://github.com/gristlabs/grainjs/) (The library used to build the DOM)
+ - [The user support documentation](https://support.getgrist.com/)
diff --git a/package.json b/package.json
index 071256ea..f0c5f83b 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
   "repository": "git://github.com/gristlabs/grist-core.git",
   "scripts": {
     "start": "sandbox/watch.sh",
+    "start:debug": "NODE_INSPECT=1 sandbox/watch.sh",
     "install:python": "buildtools/prepare_python.sh",
     "install:python2": "buildtools/prepare_python2.sh",
     "install:python3": "buildtools/prepare_python3.sh",
diff --git a/sandbox/watch.sh b/sandbox/watch.sh
index d8b8d642..cac00b81 100755
--- a/sandbox/watch.sh
+++ b/sandbox/watch.sh
@@ -3,7 +3,6 @@
 set -x
 
 PROJECT=""
-export GRIST_EXT=stubs
 if [[ -e ext/app ]]; then
   PROJECT="tsconfig-ext.json"
 fi
@@ -18,6 +17,6 @@ fi
 
 tsc --build -w --preserveWatchOutput $PROJECT &
 catw app/client/*.css app/client/*/*.css -o static/bundle.css -v & webpack --config $WEBPACK_CONFIG --mode development --watch &
-NODE_PATH=_build:_build/stubs:_build/ext nodemon --delay 1 -w _build/app/server -w _build/app/common _build/stubs/app/server/server.js &
+NODE_PATH=_build:_build/stubs:_build/ext nodemon ${NODE_INSPECT:+--inspect} --delay 1 -w _build/app/server -w _build/app/common _build/stubs/app/server/server.js &
 
 wait
diff --git a/static/locales/fr.client.json b/static/locales/fr.client.json
index ba8fb79d..91382661 100644
--- a/static/locales/fr.client.json
+++ b/static/locales/fr.client.json
@@ -190,7 +190,7 @@
         "Raw Data Tables": "Données sources",
         "Click to copy": "Cliquez ici pour copier",
         "Table ID copied to clipboard": "Identifiant de table copié",
-        "Duplicate Table": "Dupliquer la page",
+        "Duplicate Table": "Dupliquer la table",
         "You do not have edit access to this document": "Vous n’avez pas accès en écriture à ce document",
         "Delete {{formattedTableName}} data, and remove it from all pages?": "Supprimer les données de {{formattedTableName}} et les supprimer de toutes les pages ?"
     },
diff --git a/test/test_under_docker.sh b/test/test_under_docker.sh
index 73682fc7..3e54603c 100755
--- a/test/test_under_docker.sh
+++ b/test/test_under_docker.sh
@@ -64,4 +64,4 @@ TEST_ADD_SAMPLES=1 TEST_ACCOUNT_PASSWORD=not-needed \
   GRIST_SESSION_COOKIE=grist_test_cookie \
   GRIST_TEST_LOGIN=1 \
   NODE_PATH=_build:_build/stubs \
-  $MOCHA _build/test/deployment/*.js --slow 6000 -g ${GREP_TESTS:-''} "$@"
+  $MOCHA _build/test/deployment/*.js --slow 6000 -g "${GREP_TESTS}" "$@"