Need to audit if "Network security: LAN Manager authentication level" is set to Level 5? Open RSoP, drill down to Computer Configuration > Windows Settings > Security Settings > Local Policies > Security Options . The current effective value is displayed.
Using Group Policy Viewer is relatively straightforward. Here are the steps to follow: group policy viewer
Before you start, note that the Group Policy Editor is by default (it is restricted to Pro, Enterprise, and Education). Need to audit if "Network security: LAN Manager