How to prevent touch passing through UI ?

Hi guys,

I saw a lot of other questions about this topic but none of them solved my problem. I need to prevent touch passing through UI on mobile. I have some buttons on the main menu and I need to make the game start when touching anywhere on the screen except touching over UI because buttons have their onclick functions and I don't want to start the game and display the settings panel on the same time.

Is there any solution about this ?

Thank you.