One way to control document collaboration is to require check-out of files, especially when multiple users have access to the library. If a library checkout is required, other people cannot overwrite it. However, you run the risk of preventing other people from seeing the latest changes or making changes themselves. If others need to work on the document it is important that files are checked back in quickly.
Note: Don’t configure your library to require checkout if people plan to co-author documents in the library. People cannot work simultaneously on documents when required check-out is turned on.
Require check-out of files for editing
Note: Only people who have Full Control or Design permissions can set up libraries to require check-out of files.
Go to the library you plan to work in.
Click Settings , Library Settings.
If you don't see these menu items, click Library on the ribbon, and then click
Library settings in the Settings group.
On the Settings page, under General Settings, click Versioning settings.
In the Require Check Out section, under Require documents to be checked out before they can be edited?, click Yes.
Click OK to save your settings and return to the Library Settings page.