We can achieve this using a RANK calculation. This will help identify the count of the top 10 most frequent classifications within each category in a Bar Chart.
RANK_UNIQUE(SUM([Count]))
If we then drop this onto our view, configure this table calculation (by right clicking > Edit Table Calculation) to have our Category unchecked and our Classification checked in the boxes at the bottom, we can then filter based on this ranking to only be less than 10. We can also use it to sort by converting the field to discrete (blue) and moving it between our Classification and Category fields.