multiple pointer vs code linux mint
-Linux: Shift + Alt + Arrow Keys
-Mac: Opt + Cmd + Arrow Keys
-Windows: Ctrl + Alt + Arrow Keys
Also this is what I did in Linux Mint 20.2:
1. Go to Preferences > Windows. In the Behavior tab, under Moving and Resizing Windows
I have disabled (or change to "Super") Special key to move and resize windows. It was Alt by default.
2. In VSCode I set Alt as Keybinding for Toggle Multi-Cursor Modifier and it now works (was by defoult).