Clasic editor

[Couldn’t write here at first, had to look for where to click on the line you write on. Dashes and plus signs appear every now and then. Block editor is extremely bad idea if you want the work to go quickly!! What’s wrong with a regular editor?]

To the question:
I use the Classic editor and with this theme the editor looks completely wrong. I don’t get wyswyg feeling at all. Therefore, my idea is to edit the CSS file so that it becomes wyswyg. But its not working! Doesn’t matter how I change, it looks the same in the editor anyway.
This is how it looks now (this is what i do in my other themes and it works):
——————————–
functions.php
editor-style.css
style.php
——————————–
I functions.php har jag lagt till detta f?r att editor-style.php skall fungera:
function cd_add_editor_styles()
{
add_editor_style(‘editor-style.css’);
}
In this theme it doesn’t work, have tried everything I know without success. What am I doing wrong?

[It took a long time to write this because blue lines keep appearing across it. It was the most complicated forum editor I’ve ever seen!!!]