The first time you click on a model in the Designer you will select the Entity. This will show you the gizmo (translate, rotate, scale control) in the design view, and the the Attribute Editor will show you the transform and the components.
If you click again on the model, you will select the mesh/material. The gizmo will disappear and the Attribute Editor will be replaced by the Material Editor.
The top control on the Material Editor is the “Assign Material” field. If there is a material already assigned you can remove it by clicking the x next to it’s name. Then you can click the + to select the new material. Note: the Assign Material field is only visible if you’ve selected the material from the 3D view, not if you just select it from the asset panel.
Yes it does, thank you very much =).
I’m just thinking, that maybe, having to clic a second time on an object is not very easy to find, (because not very common, am i wrong?), maybe a button in the entity panel to switch to the mat panel would be helpful.