FGT60E lost ability to select "dedicated to fortiswitch" for

Title says it...See attachmentCapture1.JPG

I broke "Internal 5" out and was able to make it "dedicated to fortiswitch" some time ago...

Then yesterday I broke out "internal 6" and "internal 7" - but I do not have the option for "dedicated to fortiswitch" now...

I'm using a FGT60E with firmware 5.6.4 (build1575). Any advice??