Steps to activated/deactivate SSO settings in SAP
SAP GUI 750
To change the logon settings.
1. Right click on System on which you want to logon.
2. Switch to network tab.
3. Highlighted checkbox is checked if SSO settings are on, please unchecked the checkbox to deactivate the SSO settings and vice-a-versa for activating the SSO settings.
Link to the documentation.