You can use labels or buttons to simulate tab controls or navigation style forms
The main reason why I moved to the latter is because only one subform is ever loaded at a time whereas with tab controls, all objects are loaded into memory whether or not they are currently displayed
There are other reasons as well e.g. issues with multirow tab control headers:
When you have many tabs on a control, the Multi Row property may seem to be the solution, but it no longer works by default. This article explains how to successfully use the Multi Row property of the Access tab control and suggests several alternatives
isladogs.co.uk
Anyway, I've just converted my test db from post #6 as a .MDB file (so no themes)
Result: tab page captions are no longer centred but I wouldn't say they are right aligned either
Removing the ampersand makes the captions centre aligned (as you pointed out earlier)
View attachment 120494
Changed the db back to ACCDB with tab control property Use themes = No. Results as above
Repeated with new ACCDB with tab control property Use themes = No. Results as above.
Changed tab control property Use themes to Yes. Captions centred again. You can see the change occur in design view
So I think that confirms beyoned doubt that the issue is due to having the tab control Use themes property = No together with using an ampersand as a shortcut key