Login dialog

Hello,
when I started WinSCP before, the login dialog appeared. It no longer appears. I probably removed the check mark. How can I get the dialog to appear again?
Thanks
Wolfgang

Please see https://winscp.net/eng/docs/ui_login#show
and Show Login dialog on startup and when the last session is closed:
https://winscp.net/eng/docs/ui_pref_window