What is this on the left side of my screen?

[userxBdp6FPtCP]

 What is this on the left side of my screen? Randomly showed up last night, it's not the edge panel, when I click it, the screen darkens and kinda locks. Can't find out what it is so don't even know how to turn it off

Edit: can't reply to your comment but thank you @LongHiker 

[MoniqueO28]

Not sure what it is. But maybe try to press and hold on it to delete it.

[seno]

It unfortunately doesn't

[Anonymous]

Test in safe mode

[LongHiker · Accepted solution]

@userxBdp6FPtCP An update to Game Plugins seemed to turn this on. I got rid of it by:

1. Opening Game Plugins
2. Click the 3 dot menu in upper right
3. Turn off "Show floating icon"