What does MinimumFunctionalLevel mean in Citrix DesktopGroup?

Recently, I have been writing a PowerShell script to give some daily task to automation and write it to the part of creating Citrix DesktopGroup. Create desktop group is fine, just use New-BrokerDesktopGroup, but I don't quite understand the parameter MinimumFunctionalLevel when querying the results of create.

New a desktop group as follows, followed by the corresponding parameters:

PS C:\ Users\ admin > New-BrokerDesktopGroup-Name "PowerShellAutoTest"-DesktopKind Shared-DeliveryType DesktopsAndApps-Description $DGDescription-PublishedName $DGPubName

Then get gave it a hand:

PS C:\ Users\ admin > Get-BrokerDesktopGroup-AdminAddress "DDC01.citrix.local"-Name * TEST* | select Name, PublishedName, SessionSupport MinimumFunctionalLevel | Format-Table-AutoSizeName PublishedName SessionSupport MinimumFunctionalLevel -PowerShellAutoTest PowerShellAutoTest Desktop SingleSession L7009

MinimumFunctionalLevel shows: L7-9. Checked the official website and said Valid values are L5, L7, L7 6. It suddenly occurred to me that when manual create Machine Catalogs, there is an option that will not be changed by default: Select the minimum functional level for this catalog... See the following figure:

So, don't worry about this value, just default.