Currently the inventory window only shows 3 items. Its like that on my laptop and my 2 huge work monitors, so i suppose its not a problem on my end. There is a HUGE wasted space, as shown in the picture. I suggest a downwards expansion of the inventory window to show at least 6 items at a time without having to scroll.

You could also hold control and press the '-' sign to demagnify your browser window that way you can see more. so control - to make things smaller, and control + to make things larger again.