The most frequently performed actions (Zoom, Expand, and Collapse) can be
    performed using the mouse instead of the Actions pulldown if you prefer.

    Double-clicking the left mouse button while the pointer is positioned over
    any entity or subentity will cause the expansion or collapse of that
    entity.  For example, double-clicking the left mouse button on the Session
    Control entity after it has already expanded would cause that entity to
    be collapsed, and vice versa.

    Single-clicking the right-most mouse button over any entity, subentity or
    instance that currently has the Zoom action enabled will automatically
    bring up that entity's Zoom display. If the Zoom action is currently not
    allowed for that entity, no action will be taken.

    Note:  If you have changed your Session Manager to use the left-handed
    button arrangement, use the left button to Zoom and the right button to
    Expand/Collapse.