Agree with Dave and Shane
I’ve always used an external monitor attached to a video card designed for this purposed. Only way to see properly.
I use AJA Kona card, however Blackmagic Decklink is also commonly used. They’re pricey but often good deals on ebay.
Then you can stop worrying at get back to editing. Watching your video in Premiere’s window is an exercise in frustration, same for all NLEs.