The problem: The order of tokens on a scene is local to each user so people don't always see the same situation if tokens are overlapping. When the GM or someone else clicks on a token to control it, it pops to the top of the stack of tokens for them, but remains where it is on everyone else's screen.
The solution: zSync fixes this by sending a message to everyone viewing the same scene when someone takes control of a token, to make it pop to the top of the stack of tokens on EVERYONE'S screen.
All you have to do is install and enable this module. There are no user interface elements.
Players who can control only one token will have to deselect their token first by dragging an empty selection box on the scene. When they click on their token it will pop to the top of the stack for themselves and everyone else.
https://github.com/Sk1mble/zsync/blob/main/no_zSync.gif - An illustration of Foundry's behaviour without zSync
https://github.com/Sk1mble/zsync/blob/main/zSync.gif - An illustration of the behaviour with zSync