menu animation transition nested smooth transition

I made an animation for the transition from the main menu to other menus(options, career etc.) in my game. All menus work with a panel false or true (thre is no scene loading). Animation in the menus; While the menu is opening, the buttons become larger and clearer from scratch, Buttons get smaller and dim as the menu closes. but during this menu transition, I make false the panel that will close, I set the panel that will open to true. During this process, how can I activate both while the animation is playing? (The animation of the closing menu and the animation of the opened menu must be at the same time)

I want to make a menu like in Drive club : https://www.youtube.com/watch?v=ejVFlTWv3Xo