Click the title of the panel (Albums if you have that view selected), Sort by, Define custom sorting.
I sort by artist, then original year, then year. But, since I have MP3 and FLAC in my library, I need to normalize the original year tags. So, I use a virtual tag called "sort original year" using the following:
$Date(<Original Year>,yyyy-MM-dd)
I used to have to do the same with year, but Steven eliminated the need for that some time ago.
Argh! Why does this forum not give any notifications?
I think I'm still a tad confused. I have my original year going by just the 4 digit year since I don't care as much about exact release dates, but trying to use the custom sorting isn't really working for me.
Going by album artist and then original year doesn't seem to be working, unless I'm doing something wrong somehow.
Edit; Okay, I think I get it now. The custom sorting doesn't auto apply itself, so after I set it up I then need to enable it it the custom sorting drop-down menu. Not explicitly clear, but I guess it works.