Casting from druid form setting

[Mongogoat]

A few days back my WoW crashed and I lost all settings (no WTF backup).
But I had a setting somewhere to Autochange Druidforms when for example mining. Or casting Rejuvenation (I did not have to click of my flightform). The same with casting from Shammy Wolf form, I did not have to click off the form to cast a spell, it did this automaticlly.

Is this a default feature, if so where can i find it ?

Or is this an addon that helps me with this ? If so, any idead what addon ?