Blender
Deselect everything
To deselect everything in Blender, press Shift + Ctrl + A. It is listed for Windows, and no Mac version is documented here.
Where it works: Industry compatible keymap
Where this comes from
Industry Compatible Keymap - Blender 2.80 Manual
Documentation checked on 2026-09-14. That is a documentation review, not a test run inside the application.