How can the transparency of a Unity UI panel be adjusted?

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The transparency of a Unity UI panel can be adjusted by changing the alpha value of the color property of the panel's graphics component.

To do this, select the panel in the Unity editor and scroll down to the Inspector window's Graphic section. Locate the Color property and click on the color picker. A window will appear where you can set the red, green, blue, and alpha values of the color.

To adjust the transparency of the panel, decrease the alpha value. A value of 0 means the panel is completely transparent, while a value of 1 means the panel is fully opaque.

Alternatively, you can also adjust the transparency of a UI panel by adding a "Canvas Group" component to the panel and modifying the "Alpha" value in the inspector.