Hiding Office 365 Ribbon in SharePoint

Question

Is it possible to create Master page in Office 365 SharePoint? If yes, how to do that?

I need to hide the office 365 ribbon (blue color) and remove below menu like New, Send To, Promote, Page Details and Analytics.

How to Achieve this task?

Answer 1

Custom master pages are currently not supported for "modern" pages.

You can find supported/unsupported customizations in below documentations:

1. Customizing "modern" site pages
2. Customizing "modern" team sites
3. Branding your SharePoint site

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There is no SharePoint out of the box option to hide office 365 ribbon at the top.

Workaround (Not recommended):

You can inject custom CSS on SharePoint online modern pages using SPFx application customizer & hide the office 365 ribbon.

Check below references for more information:

1. How can I include the same JS and CSS files on multiple SharePoint Modern Page?
2. Customize SuiteBar on modern SharePoint online site
3. Trimming the Suite Bar + Ribbon on Modern SharePoint Sites in Office 365

Note: DOM manipulation & CSS customizations are not recommended by Microsoft and some of your customization may break if Microsoft changes HTML element id/classes in new release updates.

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To hide few of the page options like Promote, New, etc. you can manage this using SharePoint out of the box permissions.

To hide these options from pages, grant visitor/read only access to users on site pages so that these options will be visible only to users with Edit or higher permissions.