Custom Editor Toolbars
The content type option “Editor” contains an option to select a editor toolbar (buttons).
By default, there are the toolbars “Full” or “Basic”. You can extend these toolbars to create your own, edit existing and even remove the existing choices.
Since the toolbar feature comes from ACF, you can use the instructions on their website at https://www.advancedcustomfields.com/resources/customize-the-wysiwyg-toolbars/.