Problem:
With project that contain many source files, the number of open windows can become difficult to manage and take a long time to manually close them all.
Resolution:
There is an option to keep the animator from opening a new window for each file it steps through. It is called 'Recycle Windows' and can be found by going to Options > Edit > Source Views. When this option is selected, the animator will keep recycling the same window while stepping through different source files.