It would be cool, if you were able to reorder the controls in the left navigation pane.
A simple "Move up" / "Move Down" like it is implemented for screens would be very helpful.
The controls are ordered with a send forward/send backwards already
It's good to know that it works, but this cannot by nothing more than a workaround (in my opinion...).
I see no reason why the "Z-Order" of controls on the screen should have influences to the order of apperance in the control-tree.
The layer of the control on the screen is just design.
I'd rather it be drag and drop then for order on the side bar
Yes, this would be great! I will forget and try to rearrange controls via the pane on the left, which would work in most UI designing technologies.
You can order controls in the left pane by selecting them, holding CTRL + UP and DOWN ARROW keys. The only element you cannot move up and down are Data Cards (form fields).
EDIT: 8/3/18: This is no longer possible! Weird. First time i've seen functionality REMOVED from PowerApps.
BUMP!! Yes this would be a super useful functionality.