Scott Kingsley Clark

Pretty easy setup.. just install and activate it on the site of your choice (or network activate) and set up the settings however you’d like.
This plugin supports both Per-Site and Per-Network (WordPress Multisite) settings, so you can fine tune your options based on your needs.
Other plugins you might be interested in:
<ul>
<li>Showing the Admin Bar in more cases – <a href="https://wordpress.org/plugins/always-show-admin-bar/" rel="ugc">Always Show Admin Bar plugin</a></li>
<li>Showing the Admin Bar to logged out users – <a href="https://wordpress.org/plugins/logged-out-admin-bar/" rel="ugc">Logged Out Admin Bar plugin</a></li>
<li>Customizing the Admin area based on role – <a href="https://wordpress.org/plugins/adminimize/" rel="ugc">Adminimize</a></li>
</ul>

Admin Bar Disabler

Pretty easy setup.. just install and activate it on the site of your choice (or network activate) and set up the settings however you'd like.

Luke Dunsmore

The WordPress admin bar is powerful — but it gets cluttered quickly. SimpleBar exists to give you back control of your WordPress admin experience.
SimpleBar is a free, lightweight tool that lets you hide what you don’t need and keep your workflow tidy.
SimpleBar gives you: 
* Custom colours for your Admin Bar (front‑end & admin) and the left Admin Menu. 
* Per‑role controls: hide menu items, add custom links with drag & drop re-order. 
* Live appearance preview and accessibility checks while editing colours. 
* Seven built-in colour presets. 
* Import/export tools for moving settings between sites. 
* Discovery of third-party admin bar menu items for role-based hiding. 
* Front-end admin bar visibility rules by role and post type.
SimpleBar is both free and open-source, and is designed for developers, web builders, site owners, and anyone who values a clean admin experience.
<h3>Notes</h3>
<ul>
<li>Reordering is best‑effort. WordPress and plugins may add nodes after our hook runs.</li>
</ul>

SimpleBar – Admin Bar Customiser

Customise the Admin Bar and Admin Menu colours with live preview, presets, accessibility checks, and role-aware controls.

Admin Bar Disabler vs SimpleBar – Admin Bar Customiser