Before the upgrades, itunes was the center of your media experience. If you wanted to play music or watch a movie, it was all. in that one app. When I downloaded a new movie I dragged it over to itunes. From this app I could play it, edit , anything. This same library, same app, had all of my usic, audiobooks, Podcasts. All toegether. Now if I want to hear a song, that I uploaded from my CDs for instance....if I type out the name of the song, I an directed to the STore, so I can buy it or rent it or whatever. But it avoids my personal collection. If I want to play a song that I own, I have to go fumbling thru a long list of 500 titles till I find it. Otherwise I take a chance I may be charged for hearing it. Of course I can go to Finder and SEARCH....but why should I?. If you remember the way iTunes was before Catalina you will see the difference.
Its not a complicated question. Bring up upur music app. Then type out the name of a song or podcast that YOU uploaded. Nothing from the store. ie maybe a song from your old CD collection. A song YOU OWN. You will be directed to the store, where you can rent it or buy it. How "wunnnerful" I can rent my own song. Or buy it again. WHy doesnt it just take me to the song I uploaded. years ago. I dont get it. Im not new to Apple. I have been around quite a while. SO I dont need a lesson. Just fix it or tell me what mysterious way there is now.