Deleting elements is really easy, you only have to select the element to be deleted and in its properties panel you can see a button with a waste bin on the top.
When you delete an element, the cell will be selected and you can create a new one in that same position. If you want to leave the cell empty you can return to the properties panel of the slide and continue working as normal.
If you want to delete an element that has been left outside the layout, you can do this directly from the list of Slide elements. You only have to click on the star found at the right of the element in the list.
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