Possibility in Box Drive - (and also in any other application (online, app,..))- to lock a file (e.g. Excel file) automatically as soon as one user is in the document.
Therefore, if the next user wants to open the same file while one user is already working on it, it gets immediately a message like "Read only". As soon as the user is out of the file, and no user has opened the file, whoever wants to open it, can open it without any warnings in editor mode.