How to replace classic SharePoint Online home pages 

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Introduction

​Sites created prior to November 2018 have a classic homepage and the option to toggle between modern and classic on all libraries and lists.

Instructions

To replace a classic homepage with a modern one, follow these steps:

1. Go to the Pages library (Settings > Site Contents > Site pages)
   2. Ensure you are in the modern experience. Select Create New > Site Page. You will be provided with a modern page template.
   3. Create your new home page and save it. You must publish it in order to select it as a homepage.
   4. From the Pages library, select the new homepage you just created above, and from the top menu, select 'Make Homepage'.