WinSCP not scaling on 4k display

The entire interface looks fine when on a 1080p screen, but it doesn't scale when it is moved onto a 4k screen. I am using the latest version of WinSCP.

Thanks for your report.
I'm working on this.
See also https://winscp.net/forum/viewtopic.php?t=22935
I'll contact you, once I have anything to test.

This issue has been added to the tracker:
https://winscp.net/tracker/1521

I'm sending you an email with a development version of WinSCP to the address you have used to register on this forum.