I can't read what I'm typing in the backend.
The font size is too small in the Backend.
The font size is fine on the frontend using Cassiopeia.
Using Joomla 4 standard templates Cassiopeia and Atum.
Global Configuration / Site / Default Editor ... set to Editor – JCE
Components / JCE Editor Pro / Global Configuration / Editor Styles is Default ...
it uses Default JCE Editor Styles
How to find css file when F12 doesn't "Inspect" your area.
Where to modify text-size ?