I often need multiple IDE instances open with several Arduinos boards, monitors, and comports. That all works fine. With IDE 1.6.5-rc5, a new sketch replaced the one shown at startup, which I prefer. Versions beyond that now have a different behavior. Opening a second sketch adds a new window and keeps the original. With three instances, I now have six windows. This is causing problems in that editing and uploading is not always the sketch version I expect.
Question: Is there a way to prevent the IDE, V1.6.13, from opening a second window but use the new sketch in place of the original, like V1.6.5-rc5?