Where can I find the source code for Alt+Tab behaviour on Ubuntu 21? What package is that?

I want to edit and customize the Alt+Tab behaviour. (i.e. viewing the open apps). I only need a direction - which package is that? Thanks!


I'm no expert in gnome-shell; but it would be an extension for gnome-shell I'd believe you'd be writing

ie. look at https://extensions.gnome.org/ and search alt tab.