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You can change the numeration to IUPAC and CAS or switch it off entirely.
The IUPAC is the International Union of Pure and Applied Chemistry. This is an organization which defines most of the standards for chemical concerns.
An “A” means that that period is a maingroup, a “B” means it is a Nebengruppe.
The CAS is the Chemical Abstracts Service. With their numeration the 18 groups have the numbers from 1 to 18. Though the IUPAC numeration is the official, the CAS numeration is what is used in classrooms and laboratories.
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