How To Arrange Split Screen They Way I Want?

I want to put spotify in the left side of my 8.8 inch screen where the maps are and the maps where Spotify resides.
I am unclear how to do this , it was fine before but I had to factory reset my phone so it may be in the Android Auto settings on my phone.
Or it could be in the settings in the Centre Display

I want the Spotify app where the digital clock currently resides (smaller split screen) and the maps where Spotify resides (larger screen)
Can anyone help me with this ? I recorded a short video to show the issue. It worked before but I find it defaults to this setup occasionally and I can't remember what I did to get it arranged the way I like it.

 
Since the update to Android Auto with the new split screen feature, I've been wanting to know how to do this also..
 
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