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Lauraq - did you try changing the font size, viz:
I can't see where anyone has told @Lauraq where to add the Qt environment variables -- i.e. User or System. That she might have to is… regrettable.
And the Computer Hope link provided seems to assume the user wants to change the PATH environment variable in the System group of env-vars. I haven't edited my PATH in 2-3 decades.
BR