In Windows at least, there are three four ways to find a field in a list like that;
1. Use the Scroll Wheel on the mouse. As you are using a Mac, you need to use the equivalent, which I think is a two finger swipe on the mouse surface. But it has been a while since I used one of those Mac mice.
2. You don't show the whole selection window in your image, but there should be a little down arrow (Disclosure Arrow) at the bottom of the list. Click that to scroll down.
3. When the selection window is open move your mouse down to highlight any field in the list. Don't click. It should show as highlighted. Now press the key for the first letter of the field you want to find, and MC will jump to that section of the list. i.e. Press key "G" to highlight "Genre". Once you are in another section of the list, you can scroll around or click any field to include the column in your View.
4. When the selection window is open move your mouse down to highlight any field in the list. Don't click. It should show as highlighted. Now use the down and up arrows to scroll through the list. You can also just scroll down from the top with the down arrow, and if flyout menus open, just use the left arrow to close them.
Also, the list will wrap from top to bottom, bottom to top. So to find the [Year] field, right-click to open the list, then press the up arrow once.