UI: 3DView Popover Adjustments

Slight adjustments to widths, and adds gaps below titles, of 'Viewport Gizmos' and 'Object Types Visibility' popovers.

Differential Revision: https://developer.blender.org/D9257

Reviewed by Pablo Vazquez

release/scripts/startup/bl_ui/space_view3d.py

@@ -5549,7 +5549,7 @@ class VIEW3D_PT_object_type_visibility(Panel):
     bl_space_type = 'VIEW_3D'
     bl_region_type = 'HEADER'
     bl_label = "View Object Types"
-    bl_ui_units_x = 6
+    bl_ui_units_x = 7
 
     def draw(self, context):
         layout = self.layout
@@ -5559,6 +5559,7 @@ class VIEW3D_PT_object_type_visibility(Panel):
         view = context.space_data
 
         layout.label(text="Object Types Visibility")
+        layout.separator()
         col = layout.column()
 
         attr_object_types = (
@@ -5933,6 +5934,7 @@ class VIEW3D_PT_gizmo_display(Panel):
     bl_space_type = 'VIEW_3D'
     bl_region_type = 'HEADER'
     bl_label = "Gizmo"
+    bl_ui_units_x = 8
 
     def draw(self, context):
         layout = self.layout
@@ -5942,6 +5944,7 @@ class VIEW3D_PT_gizmo_display(Panel):
 
         col = layout.column()
         col.label(text="Viewport Gizmos")
+        col.separator()
 
         col.active = view.show_gizmo
         colsub = col.column()