What happened to iTunes Store search in Monterey 12.2.1?

Clicking in the search box at the top of the left sidebar and then clicking iTunes Store at the top right of the main window in the Music app in macOS 12.2.1 still works for me. If iTunes Store is not one of the options, see step 3 in the "Buy music from the iTunes Store in the Apple Music app on your Mac" section of Buy music from the iTunes Store - Apple Support

Buy music from the iTunes Store in the Apple Music app on your Mac

1. Open the Apple Music app.
2. In the menu bar, choose Music > Preferences.
3. Go to the General tab, select iTunes Store, then click Ok.
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5. 
   
6. Click the search field, then enter the song or album that you want to buy.
7. Click the iTunes Store button in the upper-right corner.
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9. 
   
10. Click the price next to the song or album to buy it.
11. Sign in with your Apple ID and password to complete the purchase. Need help?

After you buy music, you can find it in your music library. 

To download music to listen to offline, click the Download button  next to a song or album.

That's the main iTunes Store screen -- same one that I see on my Mac. However, if I click in the search box (while classical guitar is already entered in the search box), that screen changes to the search results and at the top right of the search results there is an option for "Your Library" or "Apple Music" or "iTunes Store." If I click iTunes Store there (top right of the window, it displays iTunes Store search results.

I was able to figure it out. I was not signed in to my Apple Account. I thought, as before, I could SEARCH the iTunes Store without being logged in but I guess you cannot. Obviously, to purchase you must be logged in but now to search I guess you must also be logged in. These constant changes drive me insane sometimes. Thanks for the help folks! Much appreciated.

Don't know if it will work for you, but I have this issue and found, in my situation, there was a "back" arrow on the blank page where the 3 options (Your Library, Apple Music, iTunes Store) were supposed to be. I clicked on that back arrow a few times and those options appeared again and I was able to search the iTunes Store.

Hope this works for you.

You may want to contact Apple Support. There is a Get Support link at the top right of this page.

It may be hidden. Check the Music View menu and hide Playing Next or Playing Lyrics if they are showing.

"then clicking iTunes Store at the top right of the main window " no longer seems to exist - Monterrey 12.3.1 on a brand new Mac Studio. WTH? Even when it did show up on previous iTunes Applications it was archaic and not intuitive. Apple has ruined a good application. This needs to be fixed. In the meantime, how do I search the store??? Doesn't Apple want me to buy new music?

This is the exact issue I have. Have you managed to resolve it?

Yes I am experiencing this. iTine store is on I preferences, but does not appear on the right. It USED TO!! Have you managed to solve this?

Thank you! This totally worked!

My screen is like yours when I try to search in the iTunes Store. It does not give me an option. I guess there must be a glitch in Monterrey.

OMG. THANK YOU. Please upvote this answer. Saved my life!