Itunes Sync Music Check Box. How to get it to come back up

I want to get the Sync Music check box back up on itunes. I want to select certain playlists and music. I have an apple music account. Please don't tell me anything about apple music syncing with an apple music account. I am old school and want the Sync music check box to come back up. I have done this before with windows 10 and my Iphone 13. I turned something off and synced my phone. Then the sync music check check box appeared. I add songs and playlist to the ones already there. I synced my phone again and they were then on my phone. I then turned something back on and sync my phone again. I know there are better ways, I just don't care to hear them. PLEASE just let me know how to get the Sync Music check box back up. Thanks in advance.