Not sure which 3270 client you are using on Windows. I have been using the WC3270 in the CE edition. If I start terminals from a CMD window they seem to inherit the font size from that session.
I've been having problems with VM usage because the X3270 screen is so small.? On real 327X devices the physical screen and thus the display is much larger than the X3270 window on Windows (and I assume Linux, too).
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I found resizing the window fails, as well as trrying to find a method to size the font.
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How do I obtainn a larger window (e.g. size of a real 327X devixe)?? I have large monitors (2560x1600, 3850x2160, and 5120x1440).