Quote from the Release Notes:
The number of decimal places shown in the UI is no longer linked to Windows settings, which caused some user confusion. It now defaults to 2 decimal places and can be changed in the registry if required.
I had mine set through Windows to 3 d.p. Now I only get one.

Your Computer\HKEY_CURRENT_USER\SOFTWARE\Xara\XtremePro Sub x64\Sub\Options\Preferences settings show NumDecimalPlaces: 2.
Changing this and other Preferences (ReadDecimalPlacesFromWindows, ReadDecimalPlacesFromWindows) does nothing.

Can you supply the exact steps to adjust the number of decimal after the point.

Acorn