Welcome Gezgin
None of this will be new to you, I provided it already via IRC.
I often use my mousewheel on the background to switch workspaces; by going to the edge of my displays it just works (but it could be my monitor setup which is rather uncommon; see Screenshot thread if interested - Screenshot thread! - #2 by guiverc ; only two panels are visible in that photo; the panel that is always visible, plus one my mouse was hovering over, the other two or three panels are hidden until mouse is over them).
I also have many panels on my two displays (so I never have to move my mouse far on either display to reach a panel) and have the Desktop.Switcher [widget] on those panels.
In the past I did just have a panel that was the size of the Desktop.Switcher widget as my then setup
For details on use, I just followed the manual - https://manual.lubuntu.me/stable/5/5.1/lxqt-panel.html . I’m on 20.04 or the development release, but my setup hasn’t altered much since switching to LXQt in the 18.10 cycle.