Quickstep Keeps Crashing

[old-square-eyes]

Quickstep is hopeless. The nav bar always has some weird image icon in it and it keeps crashing anyway.

I have installed Nova Launcher and it seems to work well. Except Quickstep still seems to have taken my nav bar hostage and frequently crashes, and locks up the system in the process.

How can I disable Quickstep and clean up the Nav bar? For example, even with Nova enabled I still have the Quickstep app drawer (which sometimes also leads to crashes).

Long pressing on these two icons gives me nothing. I'd also like the nav bar to be on the side.