If you delete some category or beans from the default Palette content (either accidentally or intentionally), you can restore it as follows:

1. Exit the IDE.
2. Go to your user directory and go down to config/Palette subdir. In this directory, the files or directories deleted from the default palette content are presented as empty files with _hidden suffix in their names.
3. Delete these _hidden files to let the palette categories and items appear again in the IDE.

Source: NetBeans User FAQ

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