Makoto

Low-Key ToolBar makes the block editor toolbar less noticeable and improve block editor UX.
I think block editor toolbar is useful, but too big and too conspicuous and disturbing. 
Sure, top toolbar mode is not disturbing, but is not user-friendly.
This plugin add its own setting sidebar to block editor and You can control scale, opacity, vertical position of the block editor toolbar.
By adjusting these properteis, the toolbar will be less noticeable, and it will improve UX.

Low-Key ToolBar

This plugin makes the block editor toolbar less noticeable and improve block editor UX. You can control Scale, Opacity, Vertical Position of the block …

Collins Agbonghama

Simple plugin for disabling admin bar and preventing access to WordPress dashboard based on a user’s roles.
It is that simple 😀
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Admin Bar & Dashboard Access Control

I've used 2 plugins before for this stuff. This excellent little plugin makes it really easy, all in 1 plugin. Does just what it needs to and does it well.

My only complaint: it adds a new sidebar item in the Admin. It really should have it's settings under Settings or Tools sections. Only plugins with multiple pages of settings, and that need to be accessed regularly, should add more height to my sidebar. If that gets fixed, I'll change my review to 5 stars! I know it's a bit nit-picky of a complaint. I guess it shows how good this little plugin is, when that's the only thing wrong.

Works great, does the work of 2 plugins elegantly!

Disable admin bar and control users access to WordPress dashboard.

Low-Key ToolBar vs Admin Bar & Dashboard Access Control