I am using TM 2023 EDUC. I find that there are black horizontal bars at the top and bottom of my scene in the main central view window that comes and goes (basically, letterboxing of the scene). I...

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I am using TM 2023 EDUC. I find that there are black horizontal bars at the top and bottom of my scene in the main central view window that comes and goes (basically, letterboxing of the scene). It comes and goes and I have no idea how to make it go away.