From QB64.org wiki
The _PRINTMODE function returns the current _PRINTMODE status as a numerical value from 1 to 3 in graphic screen modes.
- currentPrintMode = _PRINTMODE[(imageHandle&)]
- Returns a status value from 1 to 3 designating the current mode setting:
- 1: mode is _KEEPBACKGROUND
- 2: mode is _ONLYBACKGROUND
- 3: mode is _FILLBACKGROUND (default)
- The _PRINTMODE statement and function can only be used in graphic screen modes, not SCREEN 0