From Setup, enter Sharing Settings in the Quick Find box, then select Sharing Settings. Click Edit in the Organization-Wide Defaults area. Select the Manual User Record Sharing checkbox to display the Sharing button on user detail pages, which enables users to share their records with others.
From Setup, enter Sharing Settings in the Quick Find box, then select Sharing Settings. Click Edit in the Organization-Wide Defaults area. Select the Manual User Record Sharing checkbox to display the Sharing button on user detail pages, which enables users to share their records with others.