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You can disable a menu simply by clicking on the green checkmark "Yes" in the "Enabled" column. Note that this will disable the menu for all back-office users. If you want to hide a menu from a specific set of users, edit their profile's permissions, in the "Permissions" administration page.
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You can disable a page simply by clicking on the green checkmark "Yes" in the "Enabled" column. Note that this will disable the page for all back-office users. If you want to hide a page from a specific set of users, edit their profile's permissions, in the "Permissions" administration page.
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