The problem isn’t actually anything to do with the resolution of the display, but rather Windows 10 High DPI scaling.  
On Windows 10, a workaround exists that gives usable (but not ideal) results:

• Right-click Dexterit-E Explorer shortcut to display context menu
• Select the properties option
• Select the ‘Compatibility’ tab in the properties dialog
• Click the ‘Change high DPI settings’ button
• Check the ‘Override high DPI scaling behaviour’ checkbox
• Select ‘System (Enhanced) from the ‘Scaling performed by:’ drop down
• Click ‘OK’
• Click ‘Apply’

With this work around we have seen positive results on the Surface.  A permanent automatic solution will be available in the future.