How can I show no text, only icons (and add/delete them) in tabbed compact UI

I really like the Tabbed Compact UI a lot, but I need to have small letter in LIbO UI in order to see all the texts under the button icons. Besides, not all the buttons that I need are included.

How can I customize the icon toolbar in order to include only what I need, to delete what I don’t, and also to show no text under icons, specially for Calc and Writer UI?
(Maybe there is some experimental option or feature?)