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TLS/SSL Page (Advanced Site Settings Dialog)
The TLS/SSL page on the Advanced Site Settings dialog allows you to configure options of TLS/SSL protocols for FTPS and WebDAVS.
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To reveal this page you need to select FTP or WebDAV file protocol and enable Encryption on Login dialog.
Refer to documentation of page sections:
TLS/SSL Options
Using Minimum and Maximum TLS/SSL version selections, you can restrict what versions of TLS/SSL is WinSCP allowed to use.
You may want to restrict minimum TLS/SSL version, particularly in order to prevent WinSCP from using old versions of TLS/SSL protocols that suffer form known vulnerabilities (SSL 2.0 in particular, but also SSL 3.0 and TLS 1.0).
You may want to restrict maximum TLS/SSL version, when there is an interoperability problem with your FTPS/WebDAVS server. Particularly TLS 1.1 and TLS 1.2 are new and some servers do not implement them correctly.
Uncheck Reuse TLS/SSL session ID for data connections, when there is an interoperability problem with your FTPS server when reusing the TLS/SSL session ID. The option is available for FTP protocol only.
Further Reading
Read more about Login dialog and Advanced Site Settings dialog.