How to Delete LinkedIn
Messages
Open LinkedIn and click on the “Messaging” icon at the top of the page to access your inbox.
Locate the conversation that contains the message you want to delete and click to open it.
Hover over the message you want to remove, and you will see three dots (more options) appear next to it.
Click on the three-dot menu and select "Delete" to remove the message from your chat.
If you delete a message, it will only be removed from your side; the recipient will still see it unless they delete it too.
Keep in mind that LinkedIn does not offer an “Undo” option for deleted messages, so make sure before confirming deletion