It's a "recently played" playlist, sorting it alphabetically kinda defeats the "recently played"'s purpose. Other playlists should have alphabetical option available.
I see, I've got confused since what you're showing is not a playlist view but a library view.
If you do mean sorting your playlist by X, then I'm afraid this cannot be done at all, the playtlist view has no sorting options at all.
If you mean sorting you library view (i.e. in a "recently played" view), some views (for example, "all songs") have this option.