Charsize Keyword
Corresponding System Variable:  !P.Charsize
Sets the overall character size for the annotation. A Charsize of 1.0 is normal. The size of the annotation on the axes may be set, relative to Charsize, with XCharsize, YCharsize, and ZCharsize. The main title is written with a character size of 1.25 times this parameter.
 
note
If you use !P.Multi to create a multiple plot of more than two rows or columns, PV‑WAVE decreases the character size by a factor of two.