Why is the code not saved in opencart?

Question

css

I write the required HTML code on the category page or on the product page, click save, but the changes are not saved.
The default editor is summernote.
In the store settings, on the Server tab, I don't have an editor choice.
How to solve this problem so that the code would be saved normally?
Maybe you can generally disable the summernote editor? Or change it?

Answer 1

if you make changes in the admin panel, then exit the source code in the editor before saving. or just update modifiers

Answer 2

And the rights to files and folders were correctly exposed?