A SharePoint site collection administrator can be considered as a super owner of the site collection and can control everything within the site collection like managing site collection features, search and the recycle bin. There are three ways two add a site collection administrator
- SharePoint Admin Center
- Site collection Permissions
- Using PowerShell
SharePoint Admin Center
A SharePoint admin can add a user as site collection administrator, Go to active sites and click on the site where you want to add a new site collection administrator. Click on permissions in site detail panel and then click on Manage. You will get the option to add a user as site collection administrator.
Site Collection Permissions
Only an existing Site collection admin can add another site collection admin. Click on the gear icon, and Go to site permissions, now click on Advance permissions settings. This will take you to the site collection permissions page and there you can add the site collection administrator as shown in the screenshot:
Using PowerShell
This would be simple but a SharePoint Admin can add user(s) as a Site collection administrator. PowerShell can be used when you have to add one or multiple users as site collection administrator in multiple sites. You can loop through all sites and can add the user(s) account to the using PowerShell. Below is simple cmdlet to add user as a site collection administrator:
Set-SPOUser -site $URL -LoginName $SecondaryAdmin -IsSiteCollectionAdmin $True 
Adnan is six time Microsoft MVP (Since 2015) with over 16 years of extensive experience with major expertise on SharePoint, SharePoint based development, Microsoft 365, Microsoft Teams, .Net Platform and Microsoft BI. He is currently working Sr Microsoft Consultant at Olive + Goose. He is MCT Regional Lead for Pakistan Chapter since 2012. He is working on SharePoint for past 12 years and worked on different intranet/intranet solutions for private & govt. sector majorly in United states and Gulf region and have experience of working with multiple Fortune 500 companies. He is a trainer, technology evangelist and also speaks in community forums.
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