how is the way to implement scroll view on the grid list properly?

I think you might be confusing the GridSize with the Inventory Size.
The Grid Size is what you can see at any one time. The Inventory Size is the number of items that fit in the Inventory. Such that if the number of items in your Inventory is greater than your GridSize you'll start scrolling through.

I think it'll make a lot more sense if you check the feature scene "1_2 Inventory Scroll View" This way you can check a working example.
 
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