Multi User > Opening a feature that is already locked by someone else

As a Studio user, I open a feature instance that someone has already opened (it has a colored sphere). I have a message on top of the screen that says "This feature is being locked by...". As a consequence, the "save" button of the screen is greyed (Note: a better user story would be : any user action and input field is greyed and disabled). A button "Force locking yourself" is also available in the same area (see following user story), as well as a button "Reload the project", that enables to get the modifications locally.