To the right of the layer name, in parentheses, is a count of the features with the given value. If any other filters are active, you will also see a count of the features that satisfy the active criteria; if there are any, the value name is shown in darker text. In the example shown in Step 4, you can see filters in place for two columns in the Base Canvas:
Land Use Category (L3). The total count of features with the "Mixed use" L3 Land Use Category is 921. Of these 921 features, 90 meet the specified criteria of having 100 or more employees. This capability, known as faceted searching, provides dynamic information to help you explore data and refine criteria for a feature selection.