Sprite Packer can't reduce draw call with resource load

I have sprites in Sprite folder and I have created prefabs using those sprites in resource folder.
I packed the sprites together. When I load those prefabs it doesn't reduce the draw call.
Can anyone help me?

 

The UI still needs to create and draw those individual meshes, but you can see that the _MainTex is being shared between meshes, which should lead to less state switches on the GPU (the real FPS killer).

 

I don't understand why the _MainTex is being shared between meshes. Is it because I load from resource folder?
Thanks for your help

 

Sharing textures is a good thing. It means the GPU doesn't need to swap to a different texture state to draw the next mesh, which is as fast as drawing as you can have.

 

When I made the objects available in the panel, the draw call dropped again. Is there a way to reduce the draw call for creating object from resource folder?