View menu: Expand/Collapse All
When this option is toggled on (the default), then all of the elements in a record or template will be displayed; if this option is toggled off, then only the first level–the entity–will be displayed:
(screenshot showing a record with the 'Expand/Collapse All' option toggled off).
For more control over the number of levels that are displayed in RIMMF, see the next option: Expand to Level.