I changed something I shouldn't have

[schuarta]

Help.

The little white windows icon in the bottom left corner has stopped working (opening all the Win 10 click-on panels) when I left click on it. What did I accidently screw up?

The icon still opens a box menu when I right click on it (Programs, Power, Event, System,...).

How do I return to the original left click function?

[schuarta]

Never found how I changed my display to wipe the Win 10 desktop.

Did a system restore, back to mid January, and the problem was fixed.