We can configure mass editing from Menu: Settings -> Mass Editing.

From here you can create new record for mass editing.

Select model and configure fields for mass editing.

After that click on "Add Sidebar Button".

By clicking "Add Sidebar Button" action is created for selected model. With the help of that action we can update and remove fields values that configured in to mass editing configuration.

If user want to remove that action just click on "Remove Sidebar Button".

Go to that model in which mass editing is configured.

Select records on which you want to edit or remove some fields.

You can see created mass editing options into the action bar. Select that option for mass editing

User can set or remove fields value which are configured in mass editing configuration.

You can see the mass editing changes in customer tree view..

You can see the mass editing changes in selected customer