I recently upgraded from Ubuntu 18.04 to 20.04. I use the Gnome desktop. I believe in 18.04, Gnome Tweaks tool would increase the font size of text under desktop icons. That does not appear to be the case for 20.04. I already have Large Text selected. I have eyesight issues.

Is there a css file somewhere that I can edit to achieve this?

There other issue is associated with the Tweaks tool. I have the scaling factor set to greater than 1. Every time I restart, the scaling factor is ignored and I have to nudge the value to get the system to recognize it. I researched this and it does appear to be a software bug.

Will there be a fix? Is there a work around (other than switching to another desktop)?