To add a new slide to your project, click on the Plus button on the left side:
To duplicate the current slide, click on the icon with 3 squares on the left side:
You can also rename your slide by right-clicking on the slide, then choosing Rename slide.
The option to Rename all slides automatically only works if a planning is programmed on the slide. This slide will be named after the planning (Days + Dates).
On the menu that appears when you right-click on a slide, you can also duplicate and create a new slide.