Warning: opacity affects its component as well as all internal content
To edit the opacity of any component:
- Right-click on the component to access its context menu
- Open its general Style setting
- Find the Opacity setting
- Use the input field or the range input to change the opactity value.
Looking For Transparent Background?
This is not the place for that, since opacity will affect all content inside its component.
Instead, you should use the background setting, and add transparency to the color or colors chosen, to get a transparent background. And if you use an image, use a .png image with transparency.