How to Delete User from Approval Group

Summary

Need to remove employee from Approval Group

Content

I need to remove users from a static Approval Group due to 1) role changes & 2) terminations. When I navigate to the "Approval Groups" page, the 'pencil' and 'x' to delete a user are grayed out. 

Can someone please advise if I need to be maintaining the Approval Group via a different approach? Thanks!

 

Version

20D (11.13.20.10.0)