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.