Hover actions are most often required when dropdown menus do not require a left-click to activate. The Architect needs to be "told" to Hover on a specific element before clicking on a second element. If the second element only appears on the screen after a hover, it cannot be clicked by the Architect until it is visible. Using page coordinates is not an accurate way to facilitate this, which is why Hover actions are used instead.
To create a hover action, left-click the Hover button so it is highlighted in blue, and then left-click the element to be hovered on.