There is not enough surface area in the one small pan for my family for a meal - can we use two pans? How do we adjust the heating to make it work? We tried the air fried potatoes last night but they only worked in the top pan.
You can treat the oven like any other oven with multiple racks. Personally, I do not consider the pan the came with the oven a pan I would cook with…
How you cook multiple items is highly dependent on what the items are and what temp. If you were doing SV you can put a lot in the oven. If you are using the top burner for searing you aren’t going to be searing on a second level.
You can with planning cook multiple dissimilar items in a combi oven and have them all be done at the same time by staggering when you put them in the oven.
You can certainly use multiple pans in the oven. If you are looking for pans and racks that fit the Anova, check these out: https://www.sizzleandsear.com/equipment-reviews/anova-precision-oven-accessories/