Honestly, I do not know. I transferred it to YTM, but as you note, YTM's interface is complete garbage. Particularly in the car. Google has failed me so many times now that I have no real hope that they will improve the product. There's a GPM subreddit where people are exploring alternatives:
https://www.reddit.com/r/googleplaymusic/
I have 136 GB of music. I know this because I went to download it and Google very conveniently sent it to me in
sixty-eight 2GB zip files, with songs from different albums spread randomly across the zip files. Luckily, I downloaded my music using the desktop download tool (which they disabled sometime in the past few months) about a year ago. That tool actually worked. So I have most of my music arranged in neat folders, but some portion of it is spread across a bunch of goddamned zip files, and trying to figure out what is where would be an absolute nightmare.
Dumping it all into a single folder and sorting A-Z would seem like the most logical way to try to re-order it, but then I realized that a huge amount of my collection is formatted in a manner where the first track on something will start with the number 1. So upon sorting, I'll just get a list of the first file from a ton of albums, etc. It doesn't help that probably 40GB of this music is Bob Dylan bootlegs so figuring out which version of "Like a Rolling Stone" matches with which concert would be a project unto itself.
I'm beyond irate with Google. Their customer service more or less told me to pound sand. I may just go ahead and pirate the stuff that I know I bought so I can have it neatly ordered. But there doesn't appear to be service that does the things that GPM did and I may have to Frankenstein something together.