If you have shared a ticket, the ticket will state that this is shared so you know exactly which tickets will be used by your friends. It is possible to withdraw the shared link, even after sharing the ticket. How does it work?
Find the email for your ticket download in your mailbox and click Download tickets to be directed to the ticket download page. Click Share tickets to get a list of all tickets in your order.
Under the heading Shared you will find the shared tickets as well as the option to revoke the shared link.
You can also log into your organiser's Stager account. From the menu, navigate to My Tickets. There, you select the event for which you have shared the tickets and click Share tickets. Next, click on Shared to open the field and then select the tickets you have shared already for this event. Here select the specific ticket and click Withdraw share link.