In the Menu Bar, click Edit > Preferences, then on the left side of the dialog box, select Export > Cube Image.
This section contains options for resolution, supersampling, and export type settings.
Select a render resolution for cube images.
Select a supersampling quality for cube image rendering. Higher values may impact performance.
Set the type of cube image rendering:
Separate Images (six planar images)
Vertical Cross
Horizontal Cross
Spherical Map