Odb keeps on crashing

HELP!!! Whatever I do in Design forms, my .odb keeps on crashing. Anyone knows what could be the reason for this?
I work om iMac latest update installed.

First you could do: Try it in ā€œSafe modeā€ (Help ā†’ Restart in Safe mode).

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I had a ā€˜unknownā€™ bug in my form, deleted the form and redesigning it helped.

Can I ask you another question: how do I change parameters of a navigation bar on a subform? cf. attachment
The arrows etc. are no really visible.

You can, but please open another topic for the new question. (So others may find answers later more easily. So this is not to help you, but later users of this site.)
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For the same reason, Iā€™d ask you to consider your own answer as solution, as you wrote

If Roberts recommendation would be really your solution, this would hint to a problem in your user-profile instead.
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And at last: If you still have your old version, and a reproducible way to crash Libre Office, consider a bug-report, as a crash is always a bug. But this will only be useful, if you can share the file at bugzilla.

Nobody here has the faintest chance to know that.