The User tab ribbon is a custom (quick menu). It is used to manage user navigation in a Set of Books. You may select (tick) the "Auto-learn" feature to add the last accessed options in up to six (6) groups.  

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The User tab ribbon may be changed or set manually in Setup → Access control (Setup ribbon).

Once you have populated the User ribbon, with the shortcuts (options), you may de-activate (remove the tick) in the "Auto-learn" field. 

By default, when opening the Set of Books, the Default ribbon will be displayed. It the User tab ribbon, is activated, the User tab ribbon will automatically be displayed when opening the Set of Books.

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You may also use the filter options to make filter files, save filter files and load filter files. user-tab-access-control

If any of the Control icons are added, you may remove it from the "User tab". For example, "Do year-end" is only performed once a year, you may select a different feature to replace it, or simply delete it from the list.