I'm Using bootstrap collapsable panel to display a list of items (revisions) in table format, I want to display the details of each item in the panel next to the table, this looks cluttered now, however, displaying details below each item doesn't look a better solution, do you have any suggestion or advice
Why do you want to display details next to the table? whether the user will frequently check details of each item?
As per your mock, it seems if the user is particularly interested in an item, they can view it one by one. If that's the case, you can go for a popover to view the details by reducing the real estate.