Current tasks to background

According to https://winscp.net/eng/docs/ui_progress, The minimize button should be a drop down list.

However mine looks like in the attached picture. I'm using 5.7.3 portable. This will be really useful for Synchronizing so any ideas?

TIA[/url]

Indeed a transfer that is part of synchronization cannot be moved to queue.
I have documented this:
https://winscp.net/eng/docs/ui_progress#controlling

WinSCP does not support synchronization on the background.

But why can't the transfers be put on the queue initially?

Sorry, not sure what you mean by "put on the queue initially".