@leswilkins replying to myself, in case anyone else has the same problem.

Clicking on the bookmark folder icon opens the folder and expands all the subfolders.

Clicking on the bookmark text instead of the icon opens only the folder clicked, leaving the subfolders minimised.

Quite useful when you know!

@conroyphilip: Re: your second query - try clicking the 'pin' icon at the top right corner of the bookmark bar - this solved the problem for me.

I have my V7 bookmarks arranged in folders and sub-folders. When I open a folder, often all the sub-folders are fully expanded, which can be very frustrating when there are many sub-folders. I have treid 'Collapse all' on the main menu, which collapses the main folders, but when a folder is opened, all the sub-folders are still fully expanded.
Is there any way round this?