Which parameter for motors idle time? Motors stop too quickly

Hello everyone,
My flight controller is a EMLID Edge, based on Arducopter, when I start the motors with the sticks, they stop after about half a second if you don’t push the stick up quickly enough.
The arming time is too short, they stops to quickly.
Which parameters exactly do I have to change in the QGround Control software so that I can extend this time?

Many thanks for your responses!

Can you post your parameter file?
DISARM_DELAY is a likely suspect