In LabVIEW the default font is the one use by the Windows dialogue box, it can be different between OS. In Fact, the size changes between Windows XP and Windows 7.
The problem should disappear if you change the (.ini) file of your LabVIEW. You can find it at this path:
C:\Program Files (x86)\National Instruments\LabVIEW 2021\LabVIEW.ini
Add these lines at the end of the file to have a homogeneous front panel:
For compiled executables where should I do that settings? Which section ?
you should put that keys into the EXE ini file. There's only one section with the name of the EXE...
When creating the EXE you can also use your own ini file: Usually I create the EXE once, use the default ini file created by AppBuilder to include my additional keys and then use that changed ini file for all further EXE building steps...