How do I filter out words for a kanji by its particular on-reading?

[Triramama]

In individual kanji card window (which is a separate hover tab on which shown: the kanji picture, its on, kun reading, its meaning), when I click on one of the kun readings the app automatically shows me the list of words out there that match the kanji I'm examining and the kun-reading I clicked on in the lower part of the program, where the dictionary is, but when I perform the same but only with on-reading of a kanji the program doesn't list the words that have the selected on-reading, instead this action fills the "reading" namespace in the upper-left corner to show me the available kanji matching that reading I clicked on, but I would really like if by clicking on the on-reading the zkanji app would show me the words available which contain the specificied on-reading of the specified kanji, please tell me if there's something I'm missing that can do it. Thank you.