https://www.pcgamer.com/apex-legends-could-soon-get-solo-and-duos-modes/

Respawn's surprise hit battle royale Apex Legends only supports play in squads of three, which is a little unusual given that the other big-name games in the genre—Fortnite, PUBG, Blackout—offer solo and duo play as well as squads. But if the information dug up by Fortnite dataminer ShiinaBR (who is apparently now branching into Apex Legends) is correct, solo and duo modes are on the way to Apex, too. 

The fine print in the posted image makes a few relevant references, to "2-man Squads" and "#SOLO_MODE," which are fairly self-explanatory despite the absence of any further detail.