Hi Wolfie & davehc. Wolfie - Thanks for that. Like I said, will probably have a go after Xmas. Re: OneDrive the Tb of Storage and up to Date Office apps, ease of use, auto photo back up (Android) makes this an excellent value product as far as I am concerned. Fall Creators brought back placeholders in File Explorer which is much better. A definite recommend.
davehc - thanks for tip. I tried it but nothing, alas. The odd thing is that when you navigate to the Restore button it does highlight grey, like the other two either side, but it has no function when pressed. Like I said in original post the Alt>Space keyboard shortcut brings up the dialog box, top left, but Move and Size are greyed out. It's very weird and being unable to have multiple Windows open is sometimes awkward.
If I get this fixed (or not!) I will update you. Thanks again.