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Are you using any mods? If so, I recommend switching to No Active Playset to test if any mods are interfering with the Editor.

If no mods are in use, then please verify game files. Here's how it's done depending on where you have the game:

Verify game files - Steam
  • Right-click on the game in your Library
  • Select “Properties” from the dropdown menu
  • Select the “Installed Files” tab
  • Click the “Verify integrity of game files” button

Verify game files - Microsoft Store
  • Open the Microsoft Store/Xbox app for Windows
  • In My Library, select the game title
  • Select the More options (…) button and choose Manage.
  • Select Files and then Verify and Repair.