Panasonic GTWIN Reference Manual page 121

Menus
In the top half, you see all the fixed (GTWIN) fonts used in the data listed in the
column of "Font before Conversion". Every font is only listed once, even if it is
used in multiple character strings or parts. All texts using the same font are
converted to the same font selected under "Font after Conversion".
The bottom half displays the first screen containing a part or text using the fixed
font. You can check parts from other screens by entering the screen,
replacement, or language number.
2. Double-click a fixed font to select the font to convert to
The "Font Conversion" dialog appears.
3. Set "Convert Font" to "Yes"
Now you can select either a different size for the fixed font (useful when you have
converted screen data for a bigger GT model and need to scale the texts
proportionately) or a different font.
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GTWIN Reference Manual