I don't know if I'm dumb or something like that.
When I add a tilemap collider to the tileset and a composite collider, i have a really bumpy Collider, I searched online and just found about editing the physics shape. But then I had to do it for each tile individually and the shapes wouldn't match with other tiles. Sorry if my english isn't that great, or my question is kinda dumb, im still very new to Unity.
Hi ! seems like you found the solution yourself, indeed the only way to make a straight collider using tilemap collider its editing the physics shape of each tile, the shapes can match if you take your time and dont rush it. ( Source : Myself ).
You can also use a different collider, using box 2Dcolliders with an invisible sprite, placed on top of the tiles, and then use a composite collider to unify every collider. ( this is easier I think but its not automatic )
