The only thing you can do is to shut down Discord in Task Manager.
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Say something silly, Laugh 'til it hurts, Take a risk, Sing out loud, Rock the boat, Shake things up, Flirt with disaster, Buy something frivolous, Color outside the lines, Cause a scene, Order dessert, Make waves, Get carried away, Have a great day!
The Meaning of Life, the Universe, and Everything.
I had this same problem. Not sure if it was a coincidence but it only started doing this after I bought a second monitor. In the Discord app I went to settings>overlay, and disabled the in-game overlay.