Force delete machines from Desktop Groups and then go for with catalog Removal

You can use PowerShell command:

Remove-BrokerCatalog catalogName

Configure the Logoff Behavior of a Desktop Group in XenDesktop
Start a powerShell session on XenDesktop 5

#Run the following command to load the Citrix Modules:
ASNP Citrix.*

#Run the following command to list all the Desktop Groups in the
environment and the respective properties:
Get-BrokerDesktopGroup

#Disable Shutdown After
Set-BrokerDesktopGroup -Name "Desktop Group Name"
-ShutdownDesktopsAfterUse $False

#Enable Shutdown After
Set-BrokerDesktopGroup -Name "Desktop Group Name"
-ShutdownDesktopsAfterUse $True
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