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Hi @Lanky Doodle ,
According to your description, do they have to access all libraries? If not you could set library unique permission for different users then expand library like resing said.
You could use following powershell command to disable app bar in SharePoint online.
PowerShell command:
Connect-SPOService -Url https://xxx-admin.sharepoint.com -credential ******@xxx.onmicrosoft.com
Set-SPOTemporarilyDisableAppBar $true
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