App to be blocked doesn't appear on the list

I have a set of apps that don’t appear on the blocking app chooser page, and I would like to block these apps too. I found 🔥 [High Demand] Add my own Website and Apps - #13 by Opal , but my other apps page just turns black as soon as I select it. There are no buttons for me to choose what I should do next. Is there anything i can do to block an app that I want to ?

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wanted to add an additional comment: I was able to block the app by not selecting it on the allowlist, but I still can’t find the app on the blocklist. I am not sure how Opal works in the background, but surely there should be a way to select an app/add your own domains to block