You can make a menu item which opens a new lister with the Find panel, which is nearly identical to how Opus 9 opened old Find window (just with the results appearing at the top instead of the bottom).
How to create a Styles tab-bar (like Opus 9) explains how to get the styles tabs back, and is very quick and easy.
If you installed the newer version over Opus 9 then your old Opus 9 toolbars are still there and can be turned on. You do not need to configure them again.
Parts of Opus 9 will not work properly on newer versions of Windows, and it is missing thousands of changes, fixes and features made in the many years since it was released. You're much better off adapting to and configuring Opus 11 than going back to such an old version, and it should not take long or be very painful as the program is very flexible.