How do I find previous seasons of The Morning Show?

You may open a Details page for any show if you select anywhere but Up Next. That page will list all episodes and seasons for that show. Scroll down a bit for the episode list below the big image, in one horizontal row. You may select a new start point from there.

There is also a contextual menu for shows in Up Next, but the exact action differs by device. On the Apple TV box, on smart TVs, and on HDMI streaming devices, click-and-hold a tile in Up Next to get a pop-up option to Go to Show/​View Details page. On iPhone and iPad and Mac and web, it is slightly different: find the (⋯) ‘button’ on or next to the tile for contextual options.

No, it doesn't work. Season 1 and 2 are no where to be found. I wouldn't have subscribed.