Depending on the level of customization or the level of formatting your customer wants or you want to give your users as it relates to the WordPress post editor, you may need to remove TinyMCE buttons from the WordPress editor.
Although it’s relatively easy to remove all of the buttons and, say, focus only on the HTML view, it’s also possible to remove individual buttons from the post editor so that the user only has a subset of the options that are typically available.

TinyMCE Buttons
Say, for example, you want to remove everything from the second row exception the formatting drop-down that let’s you select the heading size, paragraph, or pre
elements. It’s easy to do this using one of the hooks that WordPress provides.