I have this circle with dots that showing up on my apps. Where did it come from and how do I get rid of it?

I've attached a screen shot:

I have this circle with dots that showing up on my apps. Where did it come from and how do I get rid of it?

I've attached some screenshots:

It sort of floats on top of it. I can move it around but it doesn't seem to respond to anything.

Disclaimer: I wrote the app shown but I don't know where this came from and I don't see it on other apps.