Hello, I’m new to Unity and I’m trying to make stage curtains in a 2D game… I have seen a lot of tutorials but when I’m about to apply a mesh to my curtain, the only plane mesh that appear is the one with a cube picture (I don’t have the one with the actual plane picture)… and even if I apply that mesh, it does not show on my scene…
Please describe in more detail what you’re doing. I can’t see what “apply a mesh to my curtain” means. Maybe you mean “material” instead of “mesh”?
Perhaps posting a screen shot or two will help show the problem better?
I try to do this kind of thing but at 1:42 when I have to select a mesh, the ‘‘plane mesh’’ doesn’t exist in my unity files.
So what do you have? When you click the little round button to select a mesh, a window something like this should appear:
Please take a screen shot of what you get instead, and post it. We can’t help you if you don’t give us any detail about what’s happening.
This is all the mesh that are offered to me… and those are the ones proposed in the tutorail video I sent before :
Plane is the second item in the second row in your screen shot.
EDIT: Re-reading your post, I see you’re worried about the icon. Don’t worry about it. A plane mesh is a plane mesh.
Ok thank you… and is there a way to toggle the mesh view in the scene editing ?
I’m not 100% certain what you’re asking, but play around with the scene view render mode — that button at top left of the scene view labeled “Shaded” in your screen shot — and see if it does what you need.
This is what it did (the red rectangle is the : 
is there a way to edit the mesh so it can be like this : 
I tried to edit the bounds but there is only one small square in the middle of the red rectangle…
You don’t have a Plane there. Looks to me like a Quad. It should look like this:
Note the “Plane (Mesh Filter)” component.
Does it still work if I try to put a 3D curtain in unity 2D ?
Yes. There is no “unity 2D”. There is only Unity. 2D/3D is more a state of mind. 