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functions in power query do not work
When I click on Conditional column button, I get a blank box and I cannot do anything. This looks like a Microsoft bug. I clicked on Invoke Custom Function, that also gives me a blank box like below...
Try closing the PQ window and open it again.
If that does not help close Excel and open it again.
Such ghost window could be closed by Esc or Alt+F4 assuming you focused on it. Depends on situation only one could work, not any of them (which is more usual).