[Kugaman1]

Really?
Of course its a very easy job. You just need to make sure your tyre profile ensures the rolling radius is kept the same.

So if your current tyres are 275/35/22, when you buy some 20” wheels, you will need to put tyres sized 275/45/20 on to them.

There will be a miniscule difference in rolling radius, but all totally legal and as recommended by Volvo.

Dealer is speaking rubbish. I have 21” wheels on my 2020 xc60, but have been using 18” wheels over winter. Certainly no computer changes needed or anything like that- just remember ro reset your TPMS when you fit the new wheels!