All CMOS sensors (and CCD sensors in DSLR cameras except for the Foveon) start out as monochromatic sensors.
The sensors that are sold as color sensors have a layer of per-pixel color filter arrays, usually laid out in a Bayer pattern (invented at Kodak by Bruce Bayer). In general, the Bayer array is also called a Color Filter Array (CFA)..
To recreate a color image from such a sensor, you will need to apply a "de-bayer" process. With PixInsight, you simply have to turn the Debayer switch on.
The Bayer pattern is a repeat of a 2x2 array, and you will in addition need to tell PixInsight that the ASI071MC has the following format:
RG
GB
It is typically written as "RGGB."
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Chen