Remove Sharepoint Upgrade Bar

To remove the upgade bar the following command can be used in the sharepoint 2013 management shell

Note: Please make sure that the mangement shell is executed using elevated administrator privileges.

Get-SPWebApplication http://afz-svr-int:90 | Get-SPSite -Limit All -CompatibilityLevel 14 | Foreach-Object {$_.AllowSelfServiceUpgrade = $false }

The above command can be executed for each of the hosted sites.