To add a background image to a menu in Godot, you can use the “TextureRect” node. The TextureRect node is a simple 2D rectangle that can be used to display an image. To create a TextureRect node, right-click in the Scene tree and select “New” -> “TextureRect”.
Once you have created a TextureRect node, you can set the texture that you want to use as the background by dragging and dropping the texture file onto the “Texture” property in the Inspector. You can also change the size and position of the TextureRect node to fit your needs.