Thanks for your kind reply profimc, in the legacy cockpit sx 7 there was same idle setup as the throttle one, here is a copy from the manual:
Selecting the Spoiler idle position from one of the INFO displays:
to MENU, (SETUP appears),
(MODEL appears), (MODE appears),
to SP+L R, (0 or 1 flashes)
“0” or “1” flashes in the bottom line.
SP+L R = “0”: idle position forward (default)
SP+L R = “1”: idle position back
Use the 3-D digi-adjustor to select 0 (forward) or 1 (back).
In the current cockpit sx9 I cannot find this
warm regards
Carlo