canvas change alpha channel button automatically

i have this kind of canvas. if a create a button and start game, the button became semi-visible (alpha channel of sprite image of the button change) and it became impossible to click

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someone knows why? thanks!

Check Interactable checkmark and it should work. Alternatively you can always remove canvas group it’s not a must have.

i create another canvas same of the first. and here the button works!!! i don’t understand!! but it works. thanks