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Reply to Xcode 12.3 Release Simulators Dock Yellow / buggy
Disabling discrete GPU use in Simulator seems to be a workaround. From the Simulator app menu, choose: File → GPU Selection → Prefer Integrated GPU Restart the Simulator app if needed. There is no need to unplug the cables etc. By default, the "Automatic" option is selected, and it seems that when you start the Simulator app without being plugged into the power source, an integrated GPU is used. This is probably why the cable unplugging and plugging again is working for some people. I noticed that the yellow tint glitch only appears when a discrete GPU is used. Forcing the Simulator app to prefer an integrated GPU solves the issue for me. Unfortunately, when integrated GPU is used, even basic UI animations are miserably slow in the simulator.
Dec ’20