A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Atul Kumar,
Good day!!
I understand your concern but since it’s related to SharePoint Server 2019, we would like to suggest you to post your concern in the related Microsoft Community i.e., Questions - Microsoft Q&A with SharePoint Server tag to get the detailed help from the experts.
Moreover, I found the related thread during my search and please refer to see whether it helps you: Session timeout in SharePoint 2019
Apologies for redirecting you to different community as the members in the category posted focus on the users with the SharePoint Online out of the box concerns and have limited knowledge on the SharePoint Server, so to get the fast and better assistance, we have redirected you in the correct guidance.
Thanks for your patience and understanding. Have a good day!!
Best Regards,
Sophia