Unable to disable conversation for secondary account

I’ve come across a rather strange issue in where I can’t seem to be able to disable conversation view for my secondary account(I have two). 

The gist of it is, that I don’t use conversation view and so I disabled it immediately after restoring my email backup after upgrading. Which seemed to work fine, until I checked my second email account inbox and found that all of the emails were combined in conversation view. 

Trouble is, I can’t for the likes of me figure out how to disable it since the feature is already marked as disabled in my settings. 

Any ideas?