Article 4X7SZ Strange box in the bottom right hand corner of the screen

Strange box in the bottom right hand corner of the screen

by
nozino
from LinuxQuestions.org on (#4X7SZ)
Hello everyone !

I'm new on this forum and on Linux(i'm gonna post something in the presentation thread later this week), as you will see, i'm not a native English Speaker, i'm still learning this language but I think you can understand me :)

I recently(one week ago) installed Debian's amd64 last version, with a cinnamon Desk Environment ! Everything works well, but I have a (very) little problem. Two days ago, I think I accidentally used a wrong keyboard shortcut, because I now have a little white box at the bottom right hand corner of my screen, I say it's a box because it has the appearance of it, but I cannot click on anything on it.Right and left-click are useless on it and it appears above all my applications. I restarted many times my computers, and this "box" stays. I'm a beginner on Linux, what can I do please ? I don't understand what it is and how to make it disappear.

Here's a photo of it : https://www.risishack.com/o3xhba.png

Thank you !

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