Open the chat, click on the three dots icon at the top right and select
Leave chat. You can also do this in the chat list (
vk.com/im) by hovering over the chat and clicking the
X next to the chat name. After you leave a chat, you can’t be invited to join it again.
Should you decide to return to a chat and cannot find it in your messages, ask the chat creator to send you an invite link.