Go vote for it on this wishlist:
It’s the second feature listed:
FYI, it is possible to rearrange the list, but it is not user friendly.
The list is partially determined by what is called the “Channel” order of the cameras on Wyze’s server. The Channel order has typically been decided by the order you setup/installed the cameras in the app. So in theory, you can delete all the cameras from the app, then set them up in reverse order of how you want them to show up on your Web Portal view, with the camera you want showing up at the top generally being the last camera you setup.
This used to work perfectly that way, though it seems the version 3 app isn’t always 100% consistent with that.
And the above is a big pain, so hopefully they add the feature in the Web portal soon. I can’t remember exactly which employee was over the web portal though. I wanted to say Logan, but I think he’s head of e-commerce now. 
If I can remember who it is, maybe we can ask how updates are coming. We haven’t had an update on the Web Portal since July 11 and they used to be monthly for a while (Dec-June 2003).