why when i put my prop in the scene with the tile map the png shows up too?
Problems with tilemap
Toxe the grey border on the props like the door
yes
You can only place one tile per layer. click the tilemap and click the layers dropdown. make a new one and change the z indez by 1. this will be your props layer. whenever you want to place something not walkable, click the layers dropdown and select the one you just made.
AmongPro6800 thank you very much it worked 
why i cant select the physics proprieties if i have multiple layers?
I changed this to the "Help" tag. 