In MATLAB 6.5, there was a preference setting for tabbed/untabbed behavior in the MATLAB Editor/Debugger. This preference is no longer listed in the "Preferences -> Editor -> Display" options list.
MATLAB: How to set a preference for the MATLAB Editor/Debugger to open files in separate windows or in tabs in the same window
dockediteditorMATLABpreferencesettingstabtabbedtabsundock
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