Can't change M7000 front shifter from 2x into 3x
According to Shimano's current documentation there are separate 2x and 3x specific shifters, not a single model that can be configured either way. The web-site you linked to appears to be misleading on this point as it implies the shifters can work for both 2x and 3x.

Find the exact product codes of what you received and check against the Shimano page. If you have the 2x specific shifters, return them.