Short version:
SharePoint modern comms and team sites will soon feature the SharePoint app bar which provides quick access to customisable global navigation as well as other intranet resources making important content and resources easily accessible. This feature rollout will begin early March 2021 for most of users and only take a couple of weeks.

Details:
SharePoint modern communication and team sites will soon feature the SharePoint app bar which provides quick access to customisable global navigation as well as other intranet resources. The SharePoint app bar makes important content and resources easily accessible for users on these sites, regardless of where they might be in SharePoint.

You access the SharePoint app bar from the upper left-hand side of the browser on the SharePoint start page and throughout modern SharePoint sites. The SharePoint app bar improves global wayfinding and dynamically displays personalized content for sites, news, and files:

The app bar features customisable global navigation that leads to important intranet resources. Personalised content, news and files, is driven by Microsoft Graph and cannot be customized.  

Availability:

This feature rollout will begin early March 2021 for most of use and only take a couple of weeks. After the rollout being put on hold, this will now rollout during May 2021.

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