Apple TV app only showing iTunes content

Hi, I'm probably overlooking something very obvious. I have the Apple TV app on my MacBook Air (OS Catalina). Several weeks ago, I signed up for the Apple TV+ subscription (through my iPhone)… Free trial for one year. When I access the Apple TV app on my computer, all I seem to get is Apple TV+ content requiring me to purchase episodes from iTunes. I'd like to watch TV shows in the computer app just like I do on my iPhone. On my phone, I can access all of my favorite TV shows in the 'up next section' and watch for free. It also gives me the option of watching a TV show in Hulu, Netflix, etc. for example. So it seems like the phone app can be integrated with your TV service provider and all of your TV shows from different networks can be accessed from the app. This is not the case when I access the Apple TV app from my computer...as mentioned, I only seem to get content available on Apple TV+ and some originals. How can I get the computer app to work like the phone app? Thanks for any help.