I was using Guake but since it was not working fully within Mint 20.2 (for example, the Search function (Ctrl+Shift+F)), I uninstalled it and instead I'm using Yakuake, which seems to work perfectly.
Very quick and easy to bring up, has far more features compared to Guake. To get the correct animations the Cinnamon effects settings need changing
Excellent! You can use it like tmux. For save sessions with name tabs and open folders you can use this script https://bitbucket.org/eternicode/yakuake-sessions/overview