Before you open that file, remember the golden rule of Revit:

Since Revit 2019 is now an "Obsolete Version" in the eyes of Autodesk:

Introduced the modern tabbed interface, making it easier to switch between floor plans and 3D views.

Many large-scale infrastructure and architectural projects stay in the version they were started in to avoid data migration risks. Revit 2019 was a milestone release that introduced several "quality of life" features we now take for granted. Key Features You Should Be Using:

Work in perspective mode without the view being forced into a "crop box."

Revit 2019 can be finicky with modern "Game Ready" drivers. If you experience crashes, try switching to "Studio" or "Workstation" drivers. ⚠️ The "Point of No Return"

The first version to allow you to drag views out of the main window onto a second screen.

Ensure you have installed 2019.2.2 Hotfix or later. This is the most stable version and fixes critical "Cloud Worksharing" bugs.