Get the root SettingsGroup object and access the value for the maximum column width for comments in MATLAB.

s = settings
s.matlab.editor.language.matlab.comments.MaxWidth

ans = 

 Setting 'matlab.editor.language.matlab.comments.MaxWidth' with properties.

       ActiveValue: 75
    TemporaryValue: <no value>
     PersonalValue: <no value>
      FactoryValue: 75

Set the temporary value for the maximum column width for comments in MATLAB. The temporary value is available only for the current MATLAB session and is cleared at the end of the session. For more information about the different types of settings values, see Access and Modify Settings.

s.matlab.editor.language.matlab.comments.MaxWidth.TemporaryValue = 80
s.matlab.editor.language.matlab.comments.MaxWidth

ans = 

 Setting 'matlab.editor.language.matlab.comments.MaxWidth' with properties.

       ActiveValue: 80
    TemporaryValue: 80
     PersonalValue: <no value>
      FactoryValue: 75