The timeline lists the slides which compose the project. The slides are listed from left to right.

Each slide is represented by the 3 tracks:

The background track:

The mounting track:

Remark: The thumbnail represents the first image on the slide.

The music track:

Remark: Possible pauses are symbolized by a change in the volume to zero and the display of this icon:

To select the current slide:

Note: When previewing the selected slide is automatically defined on the current slide preview.
 

To modify an element:

You can also call a contextual menu by doing a right click ahead the thumbnail or click on the Edit button. This contextual menu allows you to select an action.

To modify several elements at one time:

You can select several slides by using the mouse and the CTRL and SHIFT:
Then, by making a right click on one of the slides of the selection, a contextual menu appears.
This menu suggests various actions making on all the slides of the selection such as:

To reorder the slide in the timeline:

Simply drag the slide to a new position with the mouse (drag & drop)

To move the music or the background associated to a slide to another slide:

Simply drag the music or background to a new position with the mouse (drag & drop)

To modify the display of the timeline:

The timeline settings commands are in the status bar, to the right, at the bottom of the main window.
Increases the size of the thumbnails but reduces the number of thumbnails shown in the timeline.
Reduces the size of the thumbnails and increases the number of thumbnails shown in the timeline.