Hi @mitu_2022 ,
 

First step should be → Go to the ‘Lobby Overview’ window and RMB on the lobby page

                                      → Then select EDIT (to check whether the lobby page is Editable)

→ If it’s locked then select ‘Edit Anyway’ and make sure the Padlock is Green
→ Then as Yohan mentioned above you can go inside the lobby page

→ Unlock the Padlock and remove the lobby element you want 
→ then lock the Padlock to save the changes 

→ Finally do the step1 again to keep the Editable setting as it was before

Best Regards,
Charana