Chris Lanphear

A very simple plugin to disable the Block Editor (formerly known as Gutenberg) and restore the classic WordPress editing experience. 
There are no settings. If Guten-bye is active, the Block Editor will be disabled for all registered post types and the original 
“Classic” editor will be used in its place.

Gutenbye

A very simple plugin to disable the Block Editor (formerly known as Gutenberg) and restore the classic WordPress editing experience.

yukyhendiawan

Disable Widgets Block is a plugin that provides a simple solution for users who prefer editing widgets in the classic style in WordPress. By specifically disabling the Gutenberg block editor for widgets, this plugin opens the door for you to return to using the familiar and easy-to-understand classic editing interface.

Disable Widgets Block

Disable Gutenberg widget blocks and restore the classic widget interface for a simple, fast, and familiar WordPress widget management experience.

Gutenbye vs Disable Widgets Block