Schwinn Meridian Adult Tricycle not easy to turn left. Turning right is fine
Some trikes drive only one rear wheel, so that when you're turning with that wheel on the inside, it will handle differently than when you're turning with that wheel on the outside. So that might explain it. If so, that's just the nature of the trike. Have someone hold up the back of the trike while you turn the pedals to see whether one wheel turns or both.
This trike looks like it should be driving both rear wheels and letting the outside wheel freewheel through turns. If that's the case, it may be that one of the freewheels is sticky.