I love the Spaces feature on my Mac. It allows me to have one desktop that’s focused on web use (Chrome), another for my communication/productivity (Slack, 1Password, Wunderlist), and a third for music (Sonos/iTunes).
And, the above is how I like them ordered. However, I increasingly found Desktop Three (music) positioning itself in the second Space (where my communication/productivity Desktop is supposed to stay).
I figured that I was somehow inadvertently changing their positions when switching between desktops; even thought this made no sense to me.
In reality, what was happening was that these Spaces were being arranged based on usage. It makes sense; I do use my Music Desktop more frequently due to switching tracks, etc., but it’s not as important to me as my Productivity Desktop, and so I didn’t want this auto organization.
To turn it off: System Preferences>Mission Control>Uncheck “Automatically rearrange Spaces based on most recent use.”