Recommendations for quickly adjusting encounter difficulty for different amounts of players?

Good morning or good night! I hope y'all are doing well. I'm a DM for a West Marches, and sometimes I will only get 1-2 players instead of 4, like I usually like, since it's midterm season. So when making encounters, are there any resources or trusted tools you'd recommend for quickly balancing encounters based on player counts? I'm looking at the levers by LazyDM a bit.

Details: Level 3 with buffed point buy (29pts), and players can be either completely 2014 or completely 2024. Most of them are less optimized/newer players.