Hello TONYDG,
How do you resize the navigation pane? Do you drag and drop the border of the navigation pane to resize its width?
When will you fail to resize it after you newly reopen the database? Do you fail to resize it after first resizing it after reopening the database? Or after specific operation?
Besides, will this situation occur on a newly created database file?
Best Regards,
Terry
MSDN Community Support
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