Mouse can't "touch" softkeys at bottom of screen

I have an S8 running Android 7.0. I've used QS before on an S7 Edge, but it had a hardware home key. The S8 has only a row of softkeys at the bottom of the screen. When I control the S8 phone from a Windows 10 PC, the mouse cannot interact with the softkeys.

All of my TeamViewer software is current, and I have the Samsung add-in installed.

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