The Shadow Tool can be used to add shadows to elements.
To add a shadow, select an element, click on the Shadow Tool and then click on 'Add Shadow'.
After a shadow is applied, colour options and Shadow Controls will appear. Use the colour pallete to change the colour and opacity of the shadow. Use the controls to adjust blur amount and move the shadow.
To remove a shadow, click on the 'Remove Shadow' button at the bottom of the Shadow Tool.