Cannot you just use a master password to protect your credentials?
https://winscp.net/eng/docs/master_password
And close WinSCP, when you do not use it? With auto saved workspace, it's easy to re-start, where you left it.
https://winscp.net/eng/docs/workspace

Hi, can I lock my WinSCP app?
For safety, most people know my PC's pass, but I want to lock WinSCP access, separately.

Well, this is a very specific use case. Will see if more people ask for this.

I can't change password for windows and some people know what it is. What's more, I don't want to show everyone that I have locked screen (provocative). I have just some private servers in WinSCP (and this is only thing which I need to lock).

I will be very thankful, when you add one of my suggestion.

Thanks for your suggestion. Though what is wrong about locking your computer (Windows)?

Hi,
I have global password, but when I type it - anyone can log in anywhere. So can you add ability to lock WinSCP when I'm going away? Or when I'm away for 5 (changable) minutes then require to retype password. Or require retype password for specific servers?

Best Regards,
Tom