First, the use of porch partition is the fundamental solution. I suggest you use the L-shaped entrance! That will save the use area, and set up a shoe cabinet in the porch! Putting a mirror on it and a light band inside it is a good design, both beautiful and economical!
Second, use plant shelter, that is, if space permits, plants can be placed at the door of the bathroom. These plants should have round leaves and thick leaves and a trunk (not suitable for climbing vines), such as cash cows (cash cows are good). . . .
Third, pay attention to the purification of the bathroom itself. You often open the bathroom window and close the door to let out the dirty air. Don't discharge it into the house or hall. It is wrong to open the bathroom door to ventilate it and discharge it into the living room. Don't bring dirty air into the living room. The simplest purification method is to use salt, which can ward off evil spirits.