Here is an update as to the issue.
I finally found where the "missing" Custom Properties info window shows up.
It opens up behind the kstars window and any opened control panel windows, such as the Ekos or Indi control panels.
So unless I minimize or close the other windows, I would not even know that the Custom Properties window opens.
Can this be corrected, to have that window open up in front of any other opened windows?

Fivel

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