How do I get this mark from my laptop?

How do I get this mark from my laptop?

I had that the other day too, just restarting.

Connect to Wi-Fi and it will turn into a "connected" sign.

By connecting to the internet.

Have you already tried white Edding or Tipp-Ex?

How did it get there? That could help with the removal. Have you started any strange program? Inserted a new background image? Wi-Fi turned off?

Didn't you see the bottom of the picture?

Close the window / file.

For a more meaningful answer, it would be nice to see the entire screen.