I have the taskbar set to autohide. Sometimes it will hide automatically, but often it will stick and only hide if I left click on it. I'm not sure if this is a bug or if there is a setting that will change this.

KDE 5.20.5
Frameworks Version: 5.78.0
Qt Version: 5.15.2
Kernel Version: 5.10.13-2-Manjaro

dual monitor setup