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LineageOS 16.0 "Calculator" (Version 9, com.android.calculator2): How to Toggle from RAD to DEG mode?

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I may be overlooking something simple but, for the life of me, I cannot seem to see how the calculator that comes with LineageOS 16.0 toggles out of RAD (radian mode) and into DEG (degree mode). Here is what I see when I tap on the display portion of the app.
But, what's weird is that I've tried long pressing and various other things and cannot seem to get out of RAD mode.

Any thoughts?