Hi @Mmartinezh ,
I think you want to display Gallery till the end of screen by Height but you also have buttons.
They are different ways to tackle this:
Method 1: Can you move the button on the top? If yes, then you can have Gallery in full stretch.
Method 2: You can use Scroll Control to display your Gallery in a Datacard and have buttons below in new Card. You need to set 1st Card to full screen height and width and next Card height to match enough Real-estate for your buttons.
That's how you get full experience + scrolling below will show buttons
Method 3: You can use Containers to to fit Gallery and buttons so they don't overlap and still take full screen.
Hope 1 of these can help you