Unable to change the version of the reviewing panes(both left and right) in Code Collaborator v7.3.7303

Unable  to change the version of the reviewing panes(both left and right) in Code Collaborator v7.3.7303 as it is reverting back to  the default one. This issue is said to be fixed in Code Collaborator v8.

I am new to this so please help me to fix the issue in Code Collaborator v7.3.7303 .