Easiest analogy..............
TRIM REL - "NOT" pushed - H500, push the stick around, reduce trim force with 4-way Trim switch.
TRIM REL - pushed - Bell 206, with friction off, push stick around, but don't let it go.
Depending on whether you have Yaw SAS, Yaw SAS P&R SAS, or Autopilot it does vary only slightly although it would/should be transparent to the operator.
In simple terms the series actuators need something to push "against" otherwise the cyclic would move and nothing else would happen. The cyclic has to be held by the force trim clutch's.
Each to their own, but I push the T/R when landing and taking off and mostly during the hover. If you have A/P ON without upper modes engaged you can push the button, set the desired attitude and release. Rinse, repeat as desired. If you have upper modes except NAV modes engaged the 4-way TRIM will steer the heading bug left or right or change ALT, A/S, or VSI as appropriate. To release upper modes you must push the A/P DECOUPLE button on the side of the grip. You may get a DECOUPLE and Master Caution depending on the software in the CAD.
Try not to push the SAS DCPL (decouple) that turns everything off. To reengage you must push the P&R // YAW RST Left, Right and Up to get it back. You might upset the Pax if you are at high speed!