Create new REG_SZ value named
PredefZoomLevels in
HKCU\Software\Xara\XtremePro\8.1\Options\Preferences key, and set it to "1410;966;300;256;128;99;48;32;6" (without quotes). Run Designer Pro and see what's in the Zoom Factor dropdown
As for the line widths, the value name (also of REG_SZ type) is
LineWidthsPoints in the same key.
You may also want to check out a value named
WheelZoomLevels in
...\Options\Mouse key - set it to "8;33;99;300;900;1200;1300" and see what happens when you zoom by mousewheel.
This works with Xara versions 6, 7 and 8 (at least with Pro versions). I haven't checked versions 4 and 5.
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