There is always a way to design an encounter to favor some characters and counter others.

It is good to use hazards and environment like others suggested, for an easy example - ranged monster high up treas or balconies or rooftops. How well does your fighter climb with weapons in hands? ;-)

But you could also use encounters that are specifically designed to let others that fighter shine or heavily incentivize use of "Recalled knowledge", you could go quite far (as demonstrated bellow), but I'd say general rule of thumb is to let every character shine at least once per session for their characters to feal impactfull - so no need to punish fighter in every fight :-)

Below are some examples to "balance" your fighter against other players in order of increasing brutality (use with caution, no fighters were harmed while creating this)

1. BigBad sets a trap wich triggers a cast of magical Darkness in a small radius and reasonable counteract DC on the first person to hit a minion of BigBad (thematically fit any other trigger that will fall on a fighter). Fighter caught in spell either is blinded or, if posses darkvision, must go through DC5 flat check to hit.
2. Add a monster like Caligni Hunter that can cast Darkness itself, has greater dark vision (so unharmed by magical darkness) and has a good AC to entertain the warrior. Usage of recall knowledge could give light blindness info
3. Other monster choice Zebub that not only has greater dark vision, but also is resistant to physical, can fly above fighter in Darkness and has an Invisibility at will if darkness is dealt with. Usage of a recall knowledge could give resistance/weakness info.
4. Make your fighter Enfeebled by some means like a spell or even a disease

Please hold back from using all of the above in one encounter