Is there anyway to customize the order of the subreddits at the top?

Like at the top of the screen, I want to customize what order the subreddits I subscribe to are in. They don't seem to be in alphabetical order, at least for me anyway (unless you click on the drop down bar). I think it's categorized by number of subscribers maybe?

I don't quite know where else to ask this so I hope this is the right place!