Create elements on the slide
When you create a slide and over over it or on the properties editing panel a + button appears on each cell. Clicking on it, you can see that the right panel shows the list of available elements. You only have to choose the type of element you want to create in the cell by clicking on it. Its properties panel will be shown automatically.
Also you can move form the list of Slide elements in the slide properties panel. You only have to click on an empty element and choose which you want to create, like if you wanted to do that from the slide.
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