In the CMS template page I have tried to click on an image that’s within an entry to style it like add a border or shadow. But images aren’t editable.
I’m having a similar problem with the text. It won’t change size when I updated it in the right-hand panel. It only seems possible to do these things by hard-coding the CSS and adding this into the head in the settings for the project. Feels like a rubbish way of having to do it.
Check our the following link and see the section Advanced Styling. To apply this to Rich Text fields that are connected to a Collection field, you have to do this to a temporary RT element with the same class name.