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Expanded nodes in File View, Project View, Favorite View... are after restarting IDE packed.
This feature is disabled by default, because of performance problems on startup. Especially scaling isn't as good as it could be. If you would have a lot off opened projects and you expand a lot folders, your startup will take ages after restart of IDE ... *** This issue has been marked as a duplicate of 55701 ***
Note that you can use -J-Dnetbeans.keep.expansion command line option to turn the expansion restoration after start on.