(1) An opaque screen can be placed between the gate and the kitchen.
(2) A pair of "Glory Elephants" are placed in the inner area of the gate, with their heads facing outward to absorb the leaked air.
(3) You can put a string of five emperors' money, six emperors' money and ten emperors' money on the mat inside the gate.
Your photo is too small to be blurred when enlarged. Can't put it on the screen according to your layout. The latter two methods are up to you.