The text block is determined from the library symbol (.dra/.psm). You should NOT use the same text block with different sizes in different symbols or you could have problems as you have found out. The best way going forward would be to change the text block sizes in your library symbols (.dra/.psm) so they all match. Originally posted in cdnusers.org by Padmin
To change sizes in your design, assuming the refdes have already been placed, you would want to change the size manually with Edit > Change (text cannot be changed if it is not visible so you can always turn off certain subclass layers when you do the Edit > Change). Once you are in this command either select the text individually or window an area by clicking the left mouse button and dragging or create a temporary group by selecting the right mouse button (RMB) - Temp Group, select the text that you want to change and do another RMB - Complete.
If the refdes are not already placed in your design, once you have the correct text block sizes in your library symbols, you could select Place > Update Symbols in the design and choose Package symbols along with the check box ""Reset symbol text locations"" near the bottom of the form. Remember the draw back to this method would be if the refdes had already been moved/placed, they will reset to the location in the .dra file.
I hope this helps.