How to manage multiple DMs across multiple campaigns

My group and I are considering shifting from Roll20 over to Foundry, as we are currently paying for the Roll20 subscription and in all our eyes, it’s not worth it.

Other than the learning curve, our biggest concern is that we have multiple people who DM in our group, which has caused some concern for us that we would be fighting for game world access to work on our respective campaigns, even if that campaign isn’t currently being run.

If anyone does, how do you manage multiple DMs across multiple different game worlds? As far as I know, you can only have 1 game world active at a time, accessible for the DM and players through the web. Is the only way to switch game worlds through the server? I have an old PC I got through my colleges recycling center that we planned to use, but if I wasn’t home, I’d want to access that outside my home network, which would require some extra work on my part.

Would this truly just come down to managing time for the game worlds being active for each respective DM?

Just wondering if anyone has experienced this issue and how they ended up resolving it.