In Manjaro (20, XFCE), my mouse wheel switches between workspaces when I scroll up/down outside a window. I can be 'active' within a window (typing, eg) and move to select or to scroll in another window, but if the cursor is outside the boundaries of an active application (browser, word processor, terminal, etc) and I scroll a single notch up/down, it switches to the next workspace in sequence.
Can anybody advise on how to stop/control this behaviour?
Research and things I've tried
Within the Workspace Switcher properties, under behaviour, I unticked "Switch workspaces using the mouse wheel". This worked briefly but was shortlived: presumably a package update somewhere has overridden this. Toggling it on and off makes no difference now.
This question is the closest I've found to a similar issue, but I'm not in a VirtualBox and don't have i3 running. I've not had any fortune in using xev other than establishing that my upward scroll is indeed button 4 and downward is button 5.
Does anybody have any recommendations on where to look for control over this? Thanks in advance.