Do not 'Show Header in a Separate Row' available for sub-grouping in Albums view

[hiccup]

For the 'Albums' view you can use sub-grouping to e.g. organise and sort albums by release types.
The problem with that is that it will often make a wasteland of a lot of the desktop space.

E.g. like this:


My request is that the same feature that is available for main grouping (which is to disable: 'Show Header in a Separate Row') also becomes available for sub-grouping.

A mockup of what that could look like:



This would make much better use of the available desktop space.