does the grid display the click for full list or did you do that? do you get the horizontal scroll bar if you do not use grid?
the limit seems to be 20 for grid and preload of horizontal list. for page view of collection it should be 30, maybe it is displayed differently with infinity scroll.
edit. why would you expect such an option of grid view? it would be an infinity scroll inside a scrollable page. with list at least you have infinity scroll sideways while the page itself has normal scroll.
edit2. you are of course aware, if you want to display it on your page with that mechanism, you can just use two different collections in grid view. I am actually not sure, how creators of many things do this. usually I see creators with a handfull of things and they do not seem to display collections of their own stuff on their creatos page, but on the right side there is a column of their projects.
I always thought that is how collections are supposed to work. you link stuff you like, and not collections of you own stuff there.