There are several options you can take. The most straight forward way to clean things up is to use the Reset To Defaults tool that is in the StartMenu>Autodesk folder. Not only will it reset your menu, but everything else. If you just want to get the default acad.cuix, you can find it it in "C:\Program Files\Autodesk\AutoCAD 2023\UserDataCache\en-us\Support".
However, it still seems that you don't understand the menu system and how it integrates into the CUI system. Each cuix can store a workspace, but the one that you see in the app is stored in your main cuix, which is usually acad.cuix. You never load an mnr. That is the resource file that the mnu\cuix uses to store button images in. It is automatically loaded when you load it's parent file. If you load an mnu file, a cuix is automatically created from it, and that's what gets loaded from then on. You can also have an mnl file to store lisp used by the cuix, and that also is automatically loaded when the cuix\mnu is loaded. The MENULOAD command is just an old interface for loading mnu files, which are not used anymore. You manage partial menus in the CUI command interface by navigating to the Partial Customization Files node of the tree. You right click on the node to show the Load command. You can right click on a cui to Unload it. Once a partial cuix is loaded, you can add it's commands\palette tabs to a workspace stored in the main cuix.
Ed
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