Tested Reaper 6.01 at 300% and 400%: themed elements like transport panel or mixer are indeed
not scaled beyond 200%. Nonthemed things like splash, settings and menu
are scaled.
Full-size screenshots:
- 200% (3840×2042, 490 KB)
- 400% (5760×3004, 550 KB)
Note the sizes of the VSTi GUI (correctly scaled by Windows’ DPI scaling) and Reaper menu relative to the fixed 200% size of Reaper themed GUI elements.