Asset Shelf: Make display popup more constistent with Asset Browser

- Use property split layout
- Use "Size" instead of "Preview Size" for the label
- Place size option at the top

scripts/startup/bl_ui/asset_shelf.py

@@ -17,10 +17,13 @@ class ASSETSHELF_PT_display(Panel):
     def draw(self, context):
         layout = self.layout
 
+        layout.use_property_split = True
+        layout.use_property_decorate = False  # No animation.
+
         shelf = context.asset_shelf
 
+        layout.prop(shelf, "preview_size", text="Size")
         layout.prop(shelf, "show_names", text="Names")
-        layout.prop(shelf, "preview_size")
 
     @classmethod
     def poll(cls, context):