jupyterlab/docs/source/user/commands.rst

Command Palette
---------------

All user actions in JupyterLab are processed through a centralized
command system. These commands are shared and used throughout JupyterLab
(menu bar, context menus, keyboard shortcuts, etc.). The command palette
in the left sidebar provides a keyboard-driven way to search for and run
any JupyterLab command:

[screenshot]

The Command Palette can be accessed using the keyboard shortcut
Command-Shift-C:

[animation]