Just in case anyone else comes across this and wants to change the default behaviour for all projects… you can do this…
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Browse to the installation directory for Unreal Engine 4
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Open the Engine directory
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Open the Config directory
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Open the file named BaseEditorPerProjectUserSettings.ini using Notepad
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Press CTRL+F5 to perform a search and enter “EditorStyleSettings”
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Within the editor style settings section add the following entry;
AssetEditorOpenLocation=MainWindow
You can change the “MainWindow” part to any of the other values from the drop down menu in UE4 if you prefer something different.
- Save the file.
All new projects you open will now use this preference.