Water heater bypass will be on the inside of the coach where the water heater is. You may have to remove a panel to get access to it.
Looks like the water heater is under/next to the bathroom sink--I would start my search there.
Are you sure you have an Atwood water heater? It may have a tankless heater which doesn't have a bypass valve (I believe they started installing those in 2017).
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