You can use ShortPoint to hide SharePoint and Office 365 ribbon and suite bar. This will improve the user experience a lot.

Step 1: Open Theme Builder

Navigate to Site Settings > ShortPoint Dashboard > Theme Builder > Customize my site

Step 2: Hide Ribbon and Suite Bar

2.1. For all site pages

Navigate to General Settings > Elements > All Sites

2.2. On Home page

Navigate to General Settings > Elements > Home Page

2.3. On mobile

Navigate to Mobile Settings > Mobile Elements

After that, all you have to do is to enable/disable Focus mode option.

Then click Publish button to save your customizations.

That's it.