Newbie here.
I installed gnome-tweek-tool and helped me to change fonts in most places. However, I can't change shown font in applications. Currently, in chrome, some apps, sites, desktop ubuntu render text in 'Ubuntu Monospace'(terminal default font) It's not Chrome issue. Font settings in chrome also don't have ubuntu monospace as active font.
And i can not find more font related options in gnome of default ubuntu settings. Monospace just horrible and hurts my eyes.
Ubuntu Monospace
set as the monospace font.