Issue with demoting players

My group has just switched GMs in the middle of our campaign, twice. As the new new GM I want to demote the two previous GMs so that they don't accidentally see any information before they log back in as players (by default you start playing a campaign as GM). From what I can tell, demoting a player should be as simple as hovering over their portrait in the campaign lobby but the option doesn't come up in my case. I don't know if this is because I'm not the original GM or what. Any help would be appreciated. Thanks in advance.

Only the original (campaign creator) GM can promote or demote players. The original (campaign creator) GM cannot be demoted.  My suggestion: have the original GM demote the other GMs. Then have the original GM switch to player view when he enters the game. You may need a 'waiting room' page so that he does not see anything important when he comes in.  - Gauss

Thanks a bunch. A waiting room wont be hard to set up. At some point we may set up a replacement campaign but that will work for now.