Transparent green rectangular box in right hand corner of my androud screen

[Android Central Question]

I opened up my device and suddenly seen an unfamiliar transparent green rectangular box in the upper right hand corner of my android. I can't get rid of it period. It's never been there before. And I can't get rid of it.

 

[B. Diddy]

Welcome to Android Central! Which phone? Does it show up in a screenshot? Does it stay there if you reboot the phone, or if you change your wallpaper?

Please register on this forum, which will allow you to engage in discussion more easily, as well as post images. https://forums.androidcentral.com/ask-question/409154-join-android-central-community.html