351M grey and black tank question

[Emtrchr]

I have a 2018 351M with the rear half bathroom. I am only seeing 2 black tanks and 1 grey tank on my rv. Can anyone explain exactly what goes to what tank. I know the rear toilet is for the back black tank, and guessing the sink dumps there as well. What about the kitchen sink, shower and front bathroom sink. Are they all going to the only grey tank? Also, the monitor display on the “one control” shows 2 grey tanks. 😧
I just picked this up a month ago and would like to know more on how this works. Thanks in advance.

[Cannon07]

2021 351MR 1 black tank for 1/2 bath toilet and sink Our one control also shows two gray but only have one
1 black tank for main toilet
1 gray tank for shower, sink and kitchen

[offtohavasu]

^^^^^What he said.