Notes. The first division of six LSs focuses on the performance of the classifiers defined in Sect. 4.2. The middle division of three LSs (marked by stars) denotes the performance of certain classifiers when the ch21 color is added to the other features used, as discussed in Sect. 6. In order to ease the comparison between the classifier with and without the ch21 color, we indicate corresponding pairs with red, blue, or purple colors. In the third division, we include results from RF_col to allow for comparison with a classifier where no variability features are used, as well as results from D19 in the fourth division to allow for comparison with our current findings. We report: Col. 1: the AGN LS defining the classifier; Col. 2: the number of AGN in the LS; Col. 3: the number of AGN candidates in the unlabeled set; Col. 4: the number of multiwavelebngth confirmed AGN in the unlabeled set and the fraction with respect to the number of candidates; Col. 5: for the three color-coded pairs of classifiers, the number of candidates in common and the percentage they represent among the total number of candidates; Col. 6: purity (this is always a lower-limit estimate); Col. 7: completeness with respect to spectroscopic AGN; Col. 8: completeness with respect to spectroscopic Type I AGN; Col. 9: completeness with respect to spectroscopic Type II AGN; Col. 10: completeness with respect to MIR AGN. Purity and completeness are computed taking into account the AGN in each LS in addition to the confirmed AGN in the unlabeled set, as explained in Sect. 5.2.