Hey, mani727! Moved this over to our Mac Technical Support. There’s currently a known issue with Catalina and Radeon Graphics at the moment. Here’s the main thread for the issue.
As a temporarily workaround, setting the Render API to OpenGL4.1 (Beta) under Options (Press ESC) may help. Our team and Apple are working on the driver issues causing the crashes or graphical glitches with the Metal graphics API, please refer to the thread above for updates.