Components (layers) tree gives you an overiew of what components you are using while creating an ad.
It also has capabilities like:
Toggling visilibity of specific components let's you work on your ad more conveniently. If you know that a specific component is in place you can simply hide it via components tree in order to have more space to work on other components which needs more work done. When you finished you can simply show all of the components again in order to see how your ad looks in overall.
1) Using visibility toggling via components tree workflow
Locking specific components let's you work on your ad more conveniently. If you know that a specific component is in place you can simply lock it via components tree in order not to accidently move it or edit it. When you finished working on your ad you can simply unlock all components.
1) Locking components via components tree workflow