Editor basics

Line numbers are displayed by default, but you can hide them by clearing the Show line numbers checkbox on the Editor | General | Appearance page of JetBrains Rider settings Ctrl+Alt+S.

Action indicators show that one or more actions are available for the current caret position. To see the available actions, press Alt+Enter or click the indicator.

Code vision adds various helpful information to types and type members.

Inlay hints are automatically inserted into your code to improve its readability.

Bookmarks let you mark code lines where you want to return later.

VCS line status highlighting identifies modified code lines if version control integration is enabled.

Breakpoints let you suspend program execution at the marked statement.

Code folding adornments help you expand and collapse code elements.

Breadcrumbs at the bottom of the editor show and allow navigating the structural path from the top of the file to the current caret position.

Syntax and error highlighting — while syntax highlighting improves the readability of clean code, error highlighting helps to visualize detected code issues.

Editor tabs help you manage multiple open documents.

File status indicator displays the number of code issues detected in the current file.

Error stripe shows different code items as clickable markers relative to their locations in the document.

Right margin visualization helps to see the maximal text column width used by the code formatter.

Quick documentation shows symbol information and documentation.

'Pencils' widget is a single entry point where you can configure highlighting and visual helpers for your code.