You may sometimes see a “not assigned” tab when creating a Shuffle Box layout. You can see that tab in the screenshot below. The “not assigned” group is the default group for all tags and it has the ID 0 (zero).
Hide the button in the Gutenberg block #
Find the menu where you select groups that should be excluded and add “not assigned”.
Hide the button in the shortcode #
Add to the shortcode
exclude=0. If you need to exclude more groups, you join the IDs into a comma-seperated list: