On a Mac, when using Lumetri, you can't use the scroll wheel or the up/down arrows to quickly and easily cycle through luts and see how each looks. You have to click the drop down menu and scroll to the next LUT and then click it.

On Windows you can use the mouse scroll wheel hovering over the menu to do it, or click in the menu and use up/down arrows to auto-select the next LUT in the list.

This bug (or lack of feature) needs to be fixed on the Mac. It takes FOREVER to sample each LUT.