How to set up wordpress text editor?

Question

WordPress

For some reason, the WordPress editor decided that he knows better than me how the text on the pages should look, so he wraps the text in . How to fix it? Of course, you can put !important in styles, but I don’t like it that way, it’s not right. And another moment. text editor, which is displayed by the Advanced Custom Fields plugin, i.e. I create a field with a text editor, but for some reason it is not quite like the standard one, for example there is no header size selection field and it deletes my spans, i.e. where I myself need spans, he cuts them out when switching to visual mode. How can all this be fixed?

Answer 1

About Advanced Custom Fields. In the Pro version, you have the option to choose an editor. And a set of elements, like mini & full
And on the first question, somehow I didn’t quite understand ... (