Hello!

I recently switched Linux Mint 17.3 to 18.1 (KDE) and I've been struggling with the behavior of Activities to the point I would like to disable them completely.

However at this point it wont let me delete the last activity, nor could I find an option to disable them completely. Could someone please point me in the right direction?

Cheers!

You'll need at least 1 "activity" just like you'll need 1 "virtual desktop" and 1 screen. So you can't delete the last one. As for how to disable it, go to "switching" and disable all the global shortcuts.