How do I restore the "Apple Music" option from Apple Music on my iMac running Sequoia 15.5

I subscribe to Apple Music. On my laptop, the options in the upper R corner are what they should be: "Apple Music" "Your Library" and "iTunes Store". But On my iMac in Apple Music, the only options are "Your Library" and "iTunes store". Clearly, I did something sometime that screwed this up? In fact a few months ago, when I tried using Apple Music on my iMac (mostly use laptop), I saw that Apple Music had "lost" all music I had downloaded after 2020. Reading my notes what I did, I had to "Sync Library". Sadly, I did not note where I found "Sync Library"--but I did restore the music I had "lost". I Googled my latest Apple Music problem but none worked. Please understand: I am a relatively ignorant about this stuff, although I've been using computers ever since RadioShack sold the Tandy.