If I have the right zoom level to make the text in the feed a sensible size, the font size in the threads is too small to read easily. Correct the zoom level in the thread and the font size in the feed becomes way too large.
This has long been a problem and I'm not sure why this is suddenly irritating me more than usual. Is it just me? Is there a setting I'm missing?
E2A: It's likely a browser issue. I've found a workaround, thanks all.
Bit of a weird one, I use the default UI myself and haven't had any issues with it. But maybe if you can post a pic it'll help us figure out what's going on?
I just tried opening the feed from a thread set at a good zoom level and it is better? I don't understand how or why. But I may have found some kind of solution by accident.
I've never noticed an issue here. Looking into it the thread messages default to 1rem, your browser's default font size. So if this isn't suitable for you you may want to change your browser's font size.
The font size in the feed is 1.25x your default font size, which seems fairly reasonable for titles. But if you want to change that you can apply some user styles. For example to make it only 1.1x as large: