Area2D detects mouse clicks via the function _input_event(.). All that's left is to write the code to do the detecting.

This image is 64圆4, so I set both values to 32, like this. Set the x and y values to half the image's height. Now, to set the shape's size, click on 'RectangleShape2D' where 'null' used to be and find the Extents property. In the Inspector, for the Shape property, click on 'null' and choose New RectangleShape2D from the dropdown menu. You need to specify the type and size of the shape this node will represent. You will notice another warning, this time on the CollisionShape2D node. Add a CollisionShape2D as a child to the Area2D node, like this. Although Area2D nodes can detect mouse clicks, they need shapes to define the area they are monitoring. You will notice a warning on the Area2D node about not having any children shapes. Instead of just using a Sprite node, add an Area2D node and make the Sprite node a child, like this. Fortunately, another node can detect clicks: The Area2D node. Unfortunately, the Sprite node does not have any capability to detect a click. Let's say you have a sprite and you want it to do something when you click on it.

Sejda add clickable shapes