What I would do is this:
1. Put $1.5 million in as the starting portfolio.
2. Put $25k in for the annual spend.
3. Put $25k in as "off chart spending" starting in 2020 in the bottom of the "Other Income/Spending" tab (second tab from the top left).
Not sure on the inflation adjusted checkbox in that case (I would guess yes, since it inflates your spending each year), but the above would be pretty close.
"At times the world can seem an unfriendly and sinister place, but believe us when we say there is much more good in it than bad. All you have to do is look hard enough, and what might seem to be a series of unfortunate events, may in fact be the first steps of a journey." Violet Baudelaire.