The toolbar at the top when editing the page displays the simple graphic objects that can be added to the current page.
The way to insert simple objects on the page is the same for all the objects and consists of the following 3 steps:
1- Selection of the object to be inserted. Once the icon representing the simple object has been selected, it will have a green background color.
2- Click on the page in the position where you want to insert the object (top left corner)
3- Keeping the mouse pressed drag the mouse until selecting the area that corresponds to the size of the object
4- Release the mouse, the object will be inserted with the defined dimensions
