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You can’t.
On the first screen, you just place the selected deck before or after anothers decks. That placement is full down of your screen, left side to the right side.
What you want swap is vehicles places. It is impossible: crews are lock on theire positions. If you want change theire places, you must training the crew on the new vehicle (10 000 SL for basic training). For that, your vehicle must not be in your actual deck (for exemple, send in holidays your T-72AV before attribute that vehicle on another crew).
I see on your screenshot yours crews for Ka-50 and T-72AV have ACE qualification. you must dont touch them if you wont paid 1 210 000 more SL for give Expert training on the new crew.