1. Open the analysis (any played game). E.g.
lichess.org/sMfG5KWg.
2. Request computer analysis.
3. Start playing moves or choose any from the list.
Blue arrow (best move), pink arrow (variation?), deep purple arrow (whatever it is), green arrow (best previous move) appears.
Optional: enable local analysis and show threats to see up to 5 different arrows simultaneously.
Bonus points for Crazyhouse analysis (to see some arrows crossing the board).
E.g.
lichess.org/nHarZi6z/black#35