I wouldn't move them, but would support an extra field in the sidebar.
I think adding a second prompt in the sidebar makes sense to me if the domains are just words, like a cleric from D&D has domains. The category here should stay though because their 'domain' could be more abstract than Sun, War, or Lizardfolk. The domain of many deities is their 'realm' or where they have the most influence. It can also be their area(s) of specialization or who typically worships them, such as weaving or hunting and craftsfolk or midwives.
I completely agree that the existing field should not be moved, but adding an additional sidebar field would be ideal.
Please do not move the existing field; I'm already using domains how I like them and moving them would be awkward. I have no problem with new alternative fields being added for the sidebar.
Both options is the clear winner.
I agree with those that say the existing field shouldn't be moved. But added sidebar fields would be useful.
counter argument to Scalenex: this could be the use case for those that wish to link the domains instead of explaining them right there and then (especially with worlds where multiple deities can rule the same domains) there's not a correct approach to this issue, both the sidebar and the main content can be argued for
I think this'd be pretty nice, however, perhaps it could be implemented in the same way as it's being for the recent sexuality field (https://www.worldanvil.com/community/voting/suggestion/4384b1ba-fd63-4651-b63e-275173d47e6b/view), to allow those that want to write more text about it could have it in the article body, and those that just want to have a short list could have it in the sidebar (and the option of using both).
divine domains are potentially complicated requiring a long form explanation, not a good fit for the sidebar
I definitely disagree with moving the existing prompt for the main body. This would mess with what has already been created by many worlds. But I have no problem with the idea of adding a sidebar option too - ideally for domains and subdomains.