NP++ don't change font

[John Spark]

I was experimenting with newly installed fonts to my windows, but NP++ does not change anything ! Font is still same. No matter I restart app or not.
I went: Style configuration > Language > Style Default.
And was changing fonts to see it in real time on my opened file. When I change font, it moves a bit, text ‘shakes’ a bit, but font is same. No matter what.

What am I doing wrong please ?

Thank you

[Jon Blanchard]

Did you choose Global Styles in the Language list and set the Font and Font Size for each style in the Style list?