To view the internal chat logs, go to Manage > Administration > Chat > Chat Logs, select a chat room and the desired time range, and click Search: 

A similar report is available for the Tech Hub chat:

Tip: To find a specific room faster, type the name of the User or the Public Topic you're looking for in the Chat Room drop-down and the menu will automatically filter and show the matching results. 

Deleting and Restoring Chat Messages

To delete a specific chat message go click on the Delete icon on the message that you wish the delete:

After you’ve deleted the message it will no longer show in the chat room:

To restore a message go back to the chat log and click on the Restore button: