Maybe get an extension chord with a switch.
You should always disconnect the power supply from power when not in use.

What exactly is being asked here, as the words used leave a lot of options for interpretation?

Are you talking about plugging and unplugging a MS2 into the Track Box they come with? Or into/out of a CS?
Or are you talking about the power supply to the track box the MS uses?

Generally, turn the power off to the layout when not in use.
Generally, the less you unplug and re-plug those DIN style connectors the better, as every time is a chance to bend some pins or make the machanical connection slightly weaker.

So if you are plugging the MS into a CS, just leave it plugged in, and when the CS is turned off its good.
If its the overall power supply to the track - put it on a power strip or similar to turn off the power to everything when the layout is not in use.

I will probably get shouted at but never mind!

I use CS3 and have an MS2.

The CS3 controls the main layout. This includes some “hobby signals” fed through an M84 – Don’t like them much but quite cheap to replace when the cats eat them or sit on them. Sometimes the M84 is fed through a 66361 power pack plugged in way under the layout

The MS2 has three uses:

1) On my workbench on a little test track to see if my repairs have worked or to experiment. Powered by another 66361 to a track box – plugged to mains way under the workbench
2) Occasional use on my “small” LGB shunting layout with power supply and track box.
3) Very occasionally plugged straight into the front of the CS3 so that visiting Grandkids can help with controlling the trains. Don’t like this much as on previous CS2 the Pin broke in the socket and had to be repaired.

So on the MS2 on the workbench when not in use I simply pull out the plug from the track box. I also do this with the M84 simply pull the plug out from the box and the signal lights go off when the CS3 is also off.

So I knew I would get shouted at and I guessed it would be by Tom (HO).

If ever you are in London mate you are more than welcome to pop in but give me notice so I can sanitise our ancient house. I will check that out house insurance is paid up. I am sitting at the workbench/desk in the railway room. There are two mobile phone charger plugs on the desk, a quite large plug for the electric bike charger that I have just been out on and not yet plugged back in to the battery. There is a charger for the Dyson Vacuum cleaner. A USB lead sticking out of the back of the computer and of course the offending plug for the marklin 66361. The page in the Manual doesn’t tell me not to do what I do:

I actually accept you are right (and knew in advance someone would pick me up) but I shall probably do nothing about it.

Need to go now and light the BBQ

Oh, not you too RWill!!! A couple of us here are worse than a nebby nose gossiping neighbor. You know the type, like Hyacinth Bucket (pronounced by her) as Bouque`t.