Summary Page overwriting the Navigation Menu on the left

On the Landing Page, I have a Navigation menu on the left and Record List on the right, When I click on the Loan Id hyperlink on one of the Record, it takes me to the Summary Page for that record clicked. Issue I am having is, the Summary page is taking up full page and overwriting the Navigation pane on the left hand. Please see 2 screenshots I have attached.

How do I get the Summary page to be restricted to the right side of the Interface section and not go over the Navigation pane on the left?

  Discussion posts and replies are publicly visible