Add a Rectangle Element
Use the create toolbar to add a shape element to your canvas.
Edit a Rectangle Element
Select the picture layer you want to edit on your canvas or in the layer list.
There are two color fields, with which you can define the border and fill color for this element.
With the border radius setting, you can create rectangles with rounded edges or circles. Use the slider to change the radius of the edges.
You can also create circles by using the maximum available border radius!
You can also add borders and shadows to any rectangle layer by activating the respective style panels.