Daniele De Santis

WordPress Manage TinyMCE Editor allows you to add buttons to WordPress TinyMCE editor. 
Using the plugin you will be able to add the following buttons to the default WordPress visual editor:
Cut 
Copy 
Paste 
Source code 
Font family selector 
Font size selector 
Style selector 
Background color 
Empty document 
Superscript 
Subscript
Select the desired buttons in the plugin’s settings page and they will be available in TinyMCE.

Manage TinyMCE Editor

Add buttons to TinyMCE, WordPress' default visual editor.

Tercan Keskin

WP Heading Buttons adds quick heading buttons (H1-H6) to both Classic Editor (TinyMCE) and Block Editor toolbars. 
Choose which levels appear, toggle Classic block support, and keep icons consistent with shared SVGs.

WP Heading Buttons

One-click heading buttons (H1-H6) for WordPress Classic Editor and Gutenberg (Block Editor).

Manage TinyMCE Editor vs WP Heading Buttons