Fullscreen mode ignores "raw full size" option (seen with cr2 format). Instead it uses the embedded view. This occurs *only* if you have XNview configured to directly use fullscreen, bypassing the regular viewer.
In other words, if the regular viewer is able to compute the full Raw, than the Fullscreen viewer just takes that full Raw. But since the fullscreen alone doesnt decode Raw, it just takes the best what it haves, in this case the embedded preview.
1.91.1 RAW Viewing in Fullscreen
Moderators: helmut, XnTriq, xnview