Font style changes not reflecting on any of the pages

I’m trying to change the font style of the docs, but it’s not reflecting on the pages.

I clicked on Project Settings → Fonts → edit → Ubuntu

But nothing changes on any of the pages.

This is what I followed:

Apologies @Shamsher_Ansari for the late reply.

Your project have a custom font assigned on it using CSS, which overrides the font in Project Settings. Please either use the CSS rules to assign font or the font settings which we provide.