I do not see GeForce RTX3060 in tested/supported graphics card document for Ansys 2021R2. This could be the reason behind the glitch in GUI.
Ref - https://www.ansys.com/content/dam/it-solutions/platform-support/previous-releases/ansys-2021-r2-graphical-display-graphics-cards-tested.pdf
You can try updating the graphics card to see if it helps.
or, try renaming the %appdata%\Ansys folder and relaunching Ansys again to see if that helps (resets config to default)
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