Thanks for the screenshot, it's an unusually informative one. Every app name that shows the wrong font (UpNote, UBL Digital, Instagram, Google, ChatGPT) contains a capital U, N, B, L, D, I, G or T, and none of the names in your chosen font do. So the font is being applied; it just looks like it doesn't include those characters.
When a font file has no glyph for one character of a name, Android falls back to Niagara's default typeface for that whole name, which would explain the mix you see. A quick test: add a second font with a complete character set (the free families on Google Fonts are a safe bet) and check whether all names switch. The steps are in Custom Fonts.
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Daniel Cardona
Sep 18
Same issue here. I use an Android z fold 4.
Surfer Bot
Sep 18
Thanks for the screenshot, it's an unusually informative one. Every app name that shows the wrong font (UpNote, UBL Digital, Instagram, Google, ChatGPT) contains a capital U, N, B, L, D, I, G or T, and none of the names in your chosen font do. So the font is being applied; it just looks like it doesn't include those characters.
When a font file has no glyph for one character of a name, Android falls back to Niagara's default typeface for that whole name, which would explain the mix you see. A quick test: add a second font with a complete character set (the free families on Google Fonts are a safe bet) and check whether all names switch. The steps are in Custom Fonts.
If it still happens with a full font, say so here in the thread and name the font you used. That would be new information for us. A related gap is already collected in Some fonts included with the themes do not support accents.
Linked to None of my apps or font go to what there supposed to be