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Look in the Bestiary, p. 21 for the guidelines to scale encounters to different number of players.
Different party sizesFor each character in the party beyond the fourth, include additional creatures worth an amount of XP equal to the Character Adjustment value for your encounter on Table 5. Don’t adjust the actual XP the characters each gain for defeating the encounter. If you have fewer than four characters, use the same process in reverse: for each missing character, remove creatures worth an amount of XP equal to the Character Adjustment on Table 5 from the encounter, but keep the XP that the characters each earn the same. It’s best to use the XP increase from more characters to add more enemies and the XP decrease from fewer characters to subtract enemies, rather than making one enemy tougher or weaker. Encounters are typically more satisfying if the number of creatures is fairly close to the number of player characters.
On page 23 there's a "weak adjustments" section if removing creatures is not doable.
I played The Lost Star with my wife as the only PC (+1 GMPC) and it went pretty well, since the number of creatures in most encounters could just be halved.