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Your question is missing a word, but I’m assuming that you mean that you want to NOT see the menu locations you’re not using. You can’t really remove those, but if you choose only the menu that you’re using, then only those will appear. The menu system is set up so that you can change between menus based on the location. You can choose what is shown by editing the locations in the Dashboard. At the bottom of the Customization page for Menus, you should see the option for Edit in Administrator. Click on that, then click on the tab for Manage Locations. If you select “Select a Menu”, then there will be NO menu displayed for that location. For Widgets, you can do the same thing. Click on Edit in Admin then you can select the widget in the location where you don’t want it and remove it.