You can configure Connection Limitation and Data Transfer Limitation here.
Max sessions per user account
Specifies the maximum number of concurrent sessions that may be opened from a single user account.
Max sessions per IP
Specifies the maximum number of concurrent sessions that a user may open from a single IP address.
Automatic idle connection timeout (for FTP/SFTP protocol)
When a client has been idle for a specific time, client will be disconnected automatically.
Max download speed per session
It limits the maximum download bandwidth for each individual session. Setting a limit of 0 KB/s means unlimited bandwidth.
Max upload speed per session
It limits the maximum upload bandwidth for each individual session. Setting a limit of 0 KB/s means unlimited bandwidth.
Max download speed for user accounts
Limits the maximum download bandwidth shared between all sessions associated with an individual user account. Setting a limit of 0 KB/s means unlimited bandwidth.
Max upload speed for user accounts
Limits the maximum upload bandwidth shared between all sessions associated with an individual User account. Setting a limit of 0 KB/s means unlimited bandwidth.
Automatic transfer connection timeout (for FTP/SFTP protocol)
When no data transfer for a specific time, client will be disconnected automatically.
Enable SSH Public Key Authentication
WingFTP uses the password for the SFTP authentication by default. If you want more secure, you can use public-key authentication.