This option allows you to customize the levels of elements that you see in a record or template display, which can sometimes help you to see what is going on more clearly.
With 'Expand to Level' set at the top level ('0'), you will see only the Entity Name for the record; this is the equivalent to collapsing all levels of the display (see the previous topic).
At level '1', you will see only the elements at the next level down. For example, this screenshot shows a work template that uses captions to groups all of the elements into their specific FRBR functions:
Here is level '2' of the same work template:
Here is level '3' of the same template:
Level '4' would expand the only remaining [+] collapsed element shown above: 'Relationship Designators for Related Works'.
You can expand up to the 7th level in a record or template, although it is unlikely that you will find a record or template that goes to that depth of levels unless you have added many caption levels to organize teh elements in your templates.