On Windows, if the device display looks like this when running Android 8 or above:
Then, it may be caused by one of the following situation:
Your graphics card does not match Genymotion Desktop requirements
Please refer to What are Genymotion Desktop requirements?
Your display drivers are not up-to-date.
Please upgrade them to their latest version.
Your PC has an Intel integrated UHD/HD GPU (Windows only)
Due to limited OpenGLES support from Intel display drivers for Windows, Genymotion Desktop has compatibility issues with Intel UHD/HD integrated GPU on Windows.
If you cannot use Genymotion Desktop on a different machine with an NVIDIA or AMD GPU, you can try lowering OpenGLES version to 3.0 or 2.0. For more details, please refer to The virtual device crashes, freezes or fails to boot on Windows
Note that this problem only affects Windows; it does not happen on Linux.
You are using a laptop with dual GPU (discrete Nvidia/AMD GPU + Intel iGPU)
You need to force Genymotion Desktop (player.exe) to use the NVidia or AMD high-performance discrete GPU instead of Intel low-performance IGP.
See How to force Genymotion Desktop use the high performance discrete GPU on laptops?