The original question :
The VOR/ADF selector on the FCU also has OFF position .I have noticed some pilots after landing select the OFF postion,though it is nowhere mentioned in the FCOM.
It's a matter of SOPs : It's better to leave that selection to the next pilot for his departure. Leaving them may in fact lead to confusion as to who made the selection and whether the selection matches the departure requirements.
The pre-departure briefing should cover that aspect of the navigation aids.
And on a parallell matter our SOP is to tun off both FD after landing. Why? Just increases chances of departing again without. Certainly not an Airbus recommendation, as far as I (or my previous airline) know. Anyone else got ideas?
Leaving switches in position doesn't guarantee that you'd get what you'd look for, in this case
1FD2 after a new power-up.
The cockpit verification check-list covers that item and forces you to confirm that both FDs are getting their source from their own system.