Solved
Fatal Error: EZ tolerance
After launch of EZ tolerance, whenever I select the first surface to find the clearance the application throws Fatal error pop up and get closed on it's own.
Article - "Premature exit when defining a new stack up in Creo EZ Tolerance Analysis and leaving mouse pointer hovering over geometry to select start feature in Creo Parametric": https://www.ptc.com/en/support/article/CS335286