For accessing the timeline view, you have to click on the button with
the clock icon in the view switcher. The first time you access to it,
the timeline window is zoomed to fit all the current elements, the same
as when you perform a search, filter or group by operation.

You can use the mouse scroll to zoom in or out in the timeline, and
click on any free area and drag for panning the view in that direction.

The records of your model will be shown as rectangles whose widths are
the duration of the event according our definition. You can select them
clicking on this rectangle. You can also use Ctrl or Shift keys for
adding discrete or range selections. Selected records are hightlighted
with a different color (but the difference will be more noticeable
depending on the background color). Once selected, you can drag and move
the selected records across the timeline.

When a record is selected, a red cross button appears on the upper left
corner that allows to remove that record. This doesn't work for multiple
records although they were selected.

Records are grouped in different blocks depending on the group by
criteria selected (if none is specified, then the default group by is
applied). Dragging a record from one block to another change the
corresponding field to the value that represents the block. You can also
click on the group name to edit the involved record directly.

Double-click on the record to edit it. Double-click in open area to
create a new record with the group and start date linked to the area you
clicked in. By holding the Ctrl key and dragging left to right, you can
create a new record with the dragged start and end date.
