If the forks are not bent, it's possible that the spokes on the
wheel are adjusted so there's less slant on them from the hub to the rim
on one side. This would shift the rim laterally. This is commonly done
on the rear wheel to provide more space on one side for the gear
cluster. It's also possible that there are more washers and spacers on
one side of the axle than the other. Sometimes, these might be
positioned outside the locking nuts on the bearing cones and secured by
a second nut or they could be placed between the cones and their locking
nuts.
These are all things you should explore when analyzing and fixing the
problem. If you do remedy the off-center alignment, the front brake
will probably need to be readjusted.

Steve McDonald