Read the tank's current
Shrimp should be able to graze and rest without being pinned by a strong jet. A high-velocity outlet may create one turbulent zone even when much of the tank is calm.
Check whether plants sway constantly or food is blown into corners. The issue may be outlet direction rather than total filtration.
Redirect before reducing filtration
Aim the outlet at glass or use a baffle designed for the filter. Keep the intake protected and preserve enough circulation to move water through the tank.
Do not turn filtration off to make the aquarium calmer. Verify that oxygenation and biological filtration remain adequate after any adjustment.
For your own tank
Observe shrimp in several parts of the tank, not only beside the outlet. If the current is strong, redirect it toward glass or hardscape and recheck circulation. A gentle aquarium still needs filtration and surface movement.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.