Yeah, it’s definitely a weird issue , since the previous steps didn’t work, here are two more things you could try:
First, try verifying UEFN files through the Epic Games Launcher.
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Open the Epic Games Launcher.
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Go to the Library section on the left-hand menu.
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Find Unreal Editor for Fortnite .
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Click on the three dots icon and select Manage.
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Select the Verify option.
Then, you can also try this:
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Close UEFN completely.
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Open File Explorer and paste this into the address bar:
"%localappdata%\UnrealEditor\Saved\Config\WindowsEditor -
Inside that folder, delete the file EditorLayout.ini and if it exists, also EditorPerProjectUserSettings.ini.
- When you restart UEFN, the editor will regenerate those files with default settings, and hopefully restore the layout.
Hope one of these helps! 