Removing two finger touch on Android Emulator

Question

I am running Linux Mint and are creating flutter apps. Once in a while when I change my workspace (CTRL + ALT + Left/Right) away from my android emulator then this weird tracer starts appearing and I can't get rid of it without closing everything on the emulator. The tracer follows my cursor and reacts to right click etc.

Has anyone any idea what this is?

Update

I just noticed that they are representing two fingers. How to get rid of it though?

Answer 1

It's a bug I think. It should only appear when you press CTRL button and disappears as soon as you release the CTRL button. To get rid of this press the zoom button once.