How to get fields to update on an export?

Hello! I am using DraftSight 2018, and I have inserted a field with the variable GETACTTAB, which I use to insert the layout tab name into the drawing as a page numbering system.

My issue is that when I export (or print) the document, the same tab name (whichever tab I have selected at the time) prints on each page.

Is there a way to force the tab name to update for each page during an export or print?

Thanks!