Multi outputs altered

What happened to 15 mono + 1 stereo???

Using Logic Pro x 10.7.5, that configuration seems to have been lost!!??
What a huge BUGGER…now we’re left with a lot of mono and a lot of stereo. Config mono tracks in DAW(Logic Pro) for kick, sn, toms…etc …15 tracks+some stereo for amb and OH, are now obsolete. WTF???

OS Monterey, Mac Mini 2018, Intel