I guess this has been asked already, but I have not found much info. The font size/family only applies to the editor window. However, it would really be great if we could change other fonts, in particular of the new WYSIWYG editor. On high-res monitors, it is very difficult to see anything with the current sizes.
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Hey @SouthPoleCat, you can adjust the all the font sizes for the entire app by going to View > Zoom In.
Or, you can adjust them using CSS. One way to do this is to add the following to userstyle.css (rendered markdown) and/or userchrome.css (the rest of the app). You can add those here Joplin > Preferences > Appearances > Show Advanced Settings:
*{
font-size: 30px !important
}
This code will also affect things like icon sizes. Once you start tweaking CSS, you can have a lot of fine-grained control. Join us over in Share your CSS to see a bunch of ways people have customized things.
Hope that helps, feel free to take a screenshot if there is a particular area you want to make larger.
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@uxamanda
I've tested it with your CSS example. Everything is big now 
But the font style of the full editor view is NOT affected! But this is the font style which is too small.
How can I increase the font size of the full editor view?
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@meisterleise Hmm, it looks like you are using the WYSIWYG editor which isn't affected by the custom CSS. I think you might be better off choosing View > Zoom In from the menu. This will make the font in the entire app larger at once.
I know. But the "zoom" affects everything, which looks very ugly. So there is no chance to change the font size of the editor? What a pity!!!
Thank you.
I wonder if you could change it the opposite way – i.e. Zoom in everything and then use CSS to shrink the rest of the app?
Yeah, that was a nice idea! 
But then the markdown area would be small too. 
Heh, well this is becoming like the "If you give a mouse a cookie..." book, but you could also make the Markdown font bigger through CSS. 
Possible, but I realize less than ideal!