There should be a scroll bar for the outer application window that you can scroll down. Hope the next version of FileMaker does not handicap windows systems with that extra window...
If nothing else works, make a script that runs the Adjust Window > resize to fit step and run it from the Scripts workspace. That should bring it back into place.
I've seen that when moving between monitors with different heights. Keyword's advice should work. I've mostly quit & restarted (depending if hosted or not).
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Yes, in essence that is what happened,"moved between monitors with different heights."
The Adjust Window script step worked great, thanks much.
As per Beverley, I had this when using dual monitors with a 'new window' script step.
Even 'resize to fit' did not always work. It depends on the size of the secondary monitor (if that's what you're using).
It's tedious, but the only way I solved this was to find a layout size that would display properly when using the 'resize to fit' script step and then redo the layouts to that size.