How to make scrollingframe contain X amount of childrens?

Hey there! I`m trying to make a catalog system and i need the scrolling frame to be able to have 90 items in it using a gridlayout. I set the canvas size a lot higher so it can take more than 1 but the childrens got resized too big, i tried to use offset on the gridlayout properties but it didn t seem to work on all devices. Can you please tell me how do i make a scrollingFrame take all 90 items [4 items on each line] and a good size?