You can optimize the arrangement of model items.
Procedure
Activate the Start tab bar.
Select the relevant model item.
Click Align and the button that arranges the model item as desired:
Bring forward: The model item will be placed in front of all other model items.
Send backward: The model item will be placed behind all other model items.
One level forward: The model item will be placed in front of the item immediately in front of it.
One level backward: The model item will be placed behind the item immediately behind it.
When groupings are arranged, the internal arrangement of the items in the grouping will remain unchanged. This means that all grouping items are placed on the level in front of, between, or behind the other items, but their position relative to each other remains the same.
When you ungroup a grouping, the objects assume their original positions relative to each other.