Pfsense 2.5.2 - Bridge TAP Server - Bridge DHCP is greyed out

[gtrdriver]

Hello

here i have a PFSENSE 2.5.2 Installation - and im Trying to create a Layer2 TAP Server Connection - After creating the Connection im Trying to activate "Bridge DHCP" and "Bridge Interface" but all "Bridge Fields" are not Editable:

Anyone have a idea whats wrong here ?

I also tryed it on a Pfsense with 2.6.0 Version but same Issue