How to Fix the selection (Don't split other class) when click the specific Class

[eddywong71]

Hi All,

I am using this expression. 

Class(OPI_Past_12_Month, Round((Max(total(OPI_Past_12_Month))-min(total(OPI_Past_12_Month)))/10,100000))

However, when i click  0<x<9900000. It still split out other class like below.

 I want to fix the selection in 0<x<9900000.

Thanks

[eddywong71]

Anyone help ?