Artboard sizing for "presenter mode"

As I’m designing, I often like to look at my designs in “presenter mode” — especially to make sure that fonts are properly sized.

However, I’m not entirely sure which Artboard size I should select to make sure that my presenter mode is showing me accurate sizes (e.g. I’m assuming if I select “fit to width” it’s going to grow/shrink some sizes to make everything fit.

So far I’ve been using 1440px Artboard size for my 13 inch macbook pro, however, if I select “Actual Size (100%)” my design stretches off the screen.

So here’s my question: how do I figure out the size that I need, in order to make sure that the Artboard matches my macbook pro exactly during presenter mode?