Step1:Go to the library you plan to work in.
Step2:Select Settings Settings: update your profile, install software and connect it to the cloud > Library Settings.
Step3:If you don’t see these menu items, on the ribbon, select Library, and in the Settings group, select Library settings.
Step4:On the Settings page, under General Settings, select Versioning settings.
Step5:In the Require Check Out section, under Require documents to be checked out before they can be edited?, select Yes.
Step6:To save your settings and return to the Library Settings page, select OK.