I am seeing nothing anywhere to switch which pet you have active. I sent my active on a mission and he was removed as my active and can not replace him as the lead on my team. The "party" page is a dead link, it doesn't lead to a page, just refreshes the current one.

Figs did you try just adding another pet to your party from their page in your stables? That's how I've been doing it.

Yup. Tried it. It won't replace the active pet. You have to remove the pet you have (which I've only been able to do by sending it on missions, but then my team isn't complete) before you can add a new/different active pet.

@Figment

Upon checking, it doesn't say there are any pets in your party atm. You can't visit a pet's Profile Page and click the "Add to Party" button?

If the pet is on a mission, you can't add them to your party. You must either wait for them to complete the mission or cancel the mission. You can cancel a mission on the Mission Log page.

To remove a pet from your party, visit their Pet Profile page and click "Disband Pet".

Please let me know if you're still having an issue.