I would be interested in this too, but with the Android app.
I set up my right hand door first, and later added my left hand door. It would be nice if I could drag/drop or swap the door icons in the app, so that the right hand door is on the right, and the left hand door is on the left.
This is using the gateway and multiple 888LM control panels; I don't know if it applies to other configurations.
Device ordering works differently on the web app vs the mobile app. On the mobile app, the devices appear in alphabetical order by name. On the web app, they appear in a fixed order that I think is the order in which the control panels were registered to the gateway.
This means that to reorder the devices on the web app, you have to physically swap the control panels around, so that their physical locations on the wall and electrical connections with the openers correspond with the order in which you currently see them on the web app. Then delete all the devices and re-add them all in your MyQ account. As you do that, give them names that put them in alphabetical order left to right, so that they appear in the desired order in the mobile app too.
If you try this advice, please post your experience whether it works for you or not.
EDIT: Reading this over I can see how the advice might be confusing, so here's a concrete example.
You have three doors, which we'll call 1, 2, and 3, and three panels, which we'll call A, B, and C, left to right. Door 1 is connected to panel A, Door 2 to panel B, and Door 3 to panel C. In the web app they appear in the sequence Door 2, Door 3, Door 1. This means the web app is listing the panels in sequence B, C, A. To fix it, you'd move the panels around so Door 1 connects to panel B, Door 2 to panel C, and Door 3 to panel A. Then delete all devices from account and re-add.