As said in this post : https://krita-artists.org/t/fonts-not-working/81402/6 Custom fonts are not working. I tried in 5.2.2 and 5.2.3. I'm on windows 10 and the font is installed. The font I'm trying is "Outfit Medium" but it seems to be a global problem. As said in the forum post, it shows correctly in the text editor preview but get replaced in the render when I click "save". Someone said going back to 5.1.5 solved the issue. Good luck.