Using the menus (top of page) doesn’t work. Insert → text box
Insert table 2x10 → don’t split tables → style done—> insert → right click → table proprieties → boarders → number 4 → ok
Form controls tool bar → click design → click text box → draw text box → right-click text box
control properties.
This is some design bug in libre office menus.
Design on → edit forms Design mode off → edit document
Save as PDF… works, finally!
sort of, back to the smaller font problem in other topic.
Thanks to those who assisted. With your help, I was able to figure out the method that works and found a possible bug in libree office writer.