SAP GUI inactivity timeout:

 

If you want to logoff your inactive users from your SAP system with the reason “idle session time out”, then you should configure related parameter in T-Code: RZ10 (Restart the system to reflect) like below..

Parameter Name: rdisp/gui_auto_logout

Here, enter the required number of seconds of inactivity before the user logged off automatically.

In addition, you can change this parameter temporary until SAP system restart via RZ11 T-code

To deactivate automatic logoff procedure then delete the parameter from the profile (T-Code: RZ10) or set the value to '0' (ZERO) ---->  default value