Victory condition / coop vs KI

We would like to play co-op without one of the three victory conditions. In the older versions this was the “Conquest”.
The problem is that in AoE IV, the AI doesn’t “give up” like it used to, even if it only has one last unit or building. We also don’t find the option to reveal the entire map for gold, as was possible in Castle before.
This is a bit annoying. Does anyone have a tip?