Sarah Lewis

This is a super-simple plugin. It does one thing: move the title field under the editor box when you’re writing a post.

Title After Editor

If you'd rather write your post title AFTER you write your post, this plugin moves the title field under the editor box.

Andrew Ozz

This plugin is intended for more advanced users that would like to change the default TinyMCE configuration in WordPress. 
It makes it very easy to add, remove or change all TinyMCE settings for the classic editor and for the classic block in the block editor.

Advanced TinyMCE Configuration

Set advanced TinyMCE options for the classic block and classic editor.

Title After Editor vs Advanced TinyMCE Configuration