If you see this message in the lower right corner of MA 1 and are therefore unable to complete the layout to click [Continue], you must first change something.
! Internal bass management requires all speakers to be connected to a subwoofer or have AES67 input mode
So if you uncheck your KH-Line Monitor and then click the [+] sign after Network enabled loudspeakers connections, you should be able to check them there and continue with your alignment.
In the next screen, connect the KH-Line Monitor by clicking [+] and than [ADD]
After configuring [Position], [Audio Interface Output] and [Sub Output] you are able to click [Continue] for the next screen.