I figured it out. Under display resolution there is a checkbox to make things larger or smaller for all displays. When set to 200% rather than the default 250% it seems to work well.
Hope maybe this can help someone else
at least under V13, setting other values than 100% caused problems. Seems different under V14 - Might be worth an issue report (forums.filemaker.com)
On Windows 7 I had issues with layouts in Table: when scrolling the cells for a line got different heights, that was a mess. Changes the settings from 125% to 100% and everything was then fine !
be aware that there are plenty of known issues with display resolution ≠ 100% on Windows OS.
Since I didn't try yet (just accepted that as-it-is fact), I can't call this my own experience.
Though could one of you do me a favor and add this to my previous report?
Just a report, kind of "not resolved with FMP14" and maybe a screenshot.
And our hope that this get's resolved with FMP 21.
(Yes, that release with the "scriptable printing control" function)