
@frob-0826
There's no option to change the site collection logo and primary navigation bar color in the SharePoint admin center, in the Microsoft 365 admin center or in the Azure portal.
As a workaround, you could use PowerShell to change all site collection logos.
Reference:
https://www.sharepointdiary.com/2016/11/sharepoint-online-how-to-change-logo-using-powershell.html
For primary navigation bar color, you should change in each site collection manually.
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