Under Delphi 10.3.3 on a laptop with a 4K screen, in an FMX program built for Win32, TFNCMap renders correctly in design mode, but the map only occupies the top-left quarter of the control at run time.
e.g. set the map alignment to alClient, and at run time the map is drawn only in the top-left quarter (half the height of the form, and half the width) with the remainder white.
On this laptop, Windows scaling (settings - display - scale and layout) is set to 200% for text to be readable. If I set it to 100% the problem goes away.
The issue only happens in Delphi FMX programs; Delphi VCL is fine and Lazarus is fine.
So it seems to only be an FMX + Windows scaling issue.
Dave