There are several reasons why an existing booking needs to be changed or adjusted.
Especially the duration of a booking is something you want to update constantly in order to keep your availabilities up-to-date.
Here is a quick step-by-step on how to do that, including a video.
1. While in your Reservations section, you should choose the Schedule view on top.
2. Find the booking you'd like to adjust.
3. Select / click on the booking. A border will appear in pink, which means you can go ahead and edit.
4. Drag the right edge of the booking box until the time you want to change it to and confirm with the checkmark on the top right hand corner. The system will ask you to approve the new duration.
5. You're good to go.