If I use high resolution (1920x1080) for operator graphics then the max font size for TooltipTextsize (PwrGe -> File -> Graph atributes -> TooltipTextsize -> 24)is too small and unreadable. I use Raspberry Pi hardware.
I edited file *.pwg (/pwrp/arm_linux/exe) line 35. on raspberry pi.
orginal line was: 139 8
edited line is: 139 64
The tooltip text became big and readable.