CMake (v3.20.0) GUI locked after configure run for opencv on windows 10

After running configure on opencv v4.5.2, cmake-gui presents only the three text fields shown and no flags display. The preset dropdown has the "<custom"> selection. There are no CMakePresets.json files in the directories. Once the gui is locked as described, you can run the configure and/or generate command using the dropdown menus but you can never see the flags listing.

As is the norm these days, all developers (I am one) do not have admin privilege on the target machine and therefore must use cmake from the download without running any install. I have deleted the cmake folder and downloaded a new copy but the gui is forever locked as shown. I assume something has been written to the registry that is not cleared out.

I have had this happen on different machines but always when attempting to build opencv. The same problem happened before with Cmake v3.19.x; however, I have currently dropped back to Cmake v3.16.x with no problem.