So in devices, as with other screens, I can do a search on, for example, motion to see all my motion sensors. I click on a motion sensor and view it. When I'm done I go to the top of the form and cilck on "Device List". I return to the device list and my search criteria of motion has disappeared. So if I want to view another motion sensor I have to rekey the word motion.
This same behavior happens in the Apps list and likely others.
So please change the bevavior so the Search field is not cleared when you return to the device list. But if I click on the left hand side to another item such as Rooms, or Apps then you would want to start with an empty search field.
You'll probably want to add the circle with an X widget (whatever it's called) so folks can clear the complete search field.