i tried out your problem, Hope we can not export the full page image in qlikview using the ExportBitMapToFIle.
using below macro i tried out to reduce the sheet zoom level and fit the all object within one sheet and export it.
But default the qlikview which take the constant zoom for the exportbitmaptofile function.
other solution ,
Using the macro you first sent the exported sheet into FitZoomToWindow level and using copy the sheet into clipboard and paste anyone file and save it .
Here i attached the qv files which describes you the issue in qlikview to export the full sheet.
Here i use the zooming option and used the ActiveDocument.ActiveSheet.CopyBitmapToClipboard script
but its also not working
Refer the attached qv file
test_data.qvw 131.2 K