The timeline is located underneath each slide. It includes:
The total length of the slide in seconds
The slide duration controls to increase or decrease the length of the slide in increments of 1 second
The button to play the active slide
The play button to play the PowToon continuously until the end
Each item on your slide is included in the timeline. You can control the entrance and exit times of your objects by clicking and dragging the vertical blue lines for each individual object.