Runtime settings > font size not working for different languages

[ct8356 1]

I am using a KTP700 BASIC HMI panel. I have two languages in the HMI program. On the inbuilt Logon screen, I want to show English text in size 21, French text in size 15. In Runtime settings > Languages and Fonts, I give each language different font sizes, but when I run the program on the HMI panel, they both show up the same size. (For example, I set English to font size 21, and French to font size 15. However, if I access the password screen in English, then later in French, the text is shown in font size 21 in both occasions). This is a problem because the French words are longer, and hence some letters get cut off. Any ideas about how to get around this? (besides just using font size 15 for both?)