When checking out an asset, you are marking them as being in the possession of someone else. This means they cannot subsequently be checked out to another person/ place until they are checked back in. It prevents “double- booking”, where one asset has been promised to or assigned to multiple people/ place.
Go to the left sidebar and select Devices > Device Details >Click on the action control of the particular device > Click on the sign-out icon > Add the Details > Click on Save.
To assign multiple an device at a time, refer device bulk checkout. (Click at section)