Maybe the naming of the property is confusing. But the idea is as follows: Suppose that the internal steps are dtsMonths, then labels, by default when "SuppressPrevUnit" is true, are for example "2022/1", "2", "3", ... "12", "2023/1", "2", i.e. the year is only displayed after the year has changed, or: the "previous" unit is suppressed. When, on the other hand, "SuppressPrevUnit" is false, the year is always shown: "2022/1", "2022/2", "2022/3", ...