TestComplete’s editor is based on an older editor framework and exposes settings for font size, gutter width, outlining, etc., but does not appear to provide a separate line-height or density control. The documentation only mentions font size and zoom level controls, not viewport density adjustments.
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I did find those settings, but they only scale the text in the horizontal direction.
Which means on a 1920x1080 screen only about 45 lines fit on the screen.
‘Zooming’ just changes the font size, wich makes more characters per line fit on screen but not more lines.