How to make permanent my toolbar's style

I created custom toolbar in my spreadsheet. It’s style is “Icons and Text”, and I see icons and texts. After saving and closing this spreadsheet and reopening it I see icons only. If I set the style to “Icons and Text” again, I see icons and texts, but after closing and reopening texts disappear. How can I make style “Icons and Text” permanent?

It is permanent in LibreOffice 5.4 and in current master build, and not permanent in LO 6.0.1. I have not tried LO 6.0.3. So the fact, that it is not permanent, is a bug, which is fixed in the meantime.