Using the other tab when a file transfer is on going

When a file transfer is in progress in a tab in WinSCP, I couldn't use any other opened tabs.
This doesn't look good.
Do we have any setting for this or is it a bug?

You can use a background transfer instead:
https://winscp.net/eng/docs/transfer_queue

In the latest beta version, you can move ongoing foreground transfer to background:
https://winscp.net/eng/docs/ui_progress#controlling