How to disable the Joomla admin menus

Step 1: Log in to your Joomla site as the administrator.
Step 2: Go to the ‘Modules’ option under the ‘Extensions’ menu from the admin panel
Step 3: Once you are in Modules list, switch to Administrator module list from the drag town.
Step 4: Choose the modules that you wish to disbale and click on ‘Un-publish’.
Step 5: Once you are done, the disabled modules will be available for ‘Publish’