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You need to right-click the app .exe or shortcut and go to the properties, and the option is in the Compatibility tab.
I am not 100% sure because I'm not using 10-bit myself but if IIRC with D3D11, fullscreen windowed can use 10-bit which would explain that it's not happening with D3D9. Maybe bringing up the OSD changes the bit depth and causes the GPU to change something else? Someone with an AMD card and a 4K TV using 10-bit should chime in.
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HTPC: Windows 10 22H2, MediaPortal 1, LAV Filters/ReClock/madVR. DVB-C TV, Panasonic GT60, Denon 2310, Core 2 Duo E7400 oc'd, GeForce 1050 Ti 536.40
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