How to turn off transparency

I am making a simple tic-tac-toe game, but everything I create (panel, image, etc) are defaulting to transparent and idk how to turn it off. Google didn’t help. How do I toggle transparency when making objects?

Specs:
I am using Unity version 2022.3.33f1.git.11716691
3d project (Built-In Render Pipeline).

Set the alpha value of the Color attribute to 100.

or 1.0 or 255 depending on the current active color mode of the color picker

True, it is 100 in HSV mode.

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