More functionals are being implemented and range-separated hybrids are a priority.
The choice of functional and related settings are performed in the input file section
@method settings dft: yes xcfun: b3lyp grid_level: 4 @end
To change to another functional, replace
b3lyp with any of the others (as spelled in the list above).
Grid densities are available up to level 6. Level 4 (default) is recommended for production calculations.