In the Version Tree Browser, you can use the button at the bottom of a version
marker or a branch marker to collapse or expand the display of the versions
and branches lower in the hierarchy.
Expand and collapse button on a version marker
Expand and collapse button on a branch marker
Find a button that has a minus (–) character. A particular
marker that has a minus character has versions or subbranches that can be
collapsed.
Click the button on the branch or version marker. The
content collapses.