Implement the "negate" search filter
I would like to get a "NOT" symbol or reserved word to filter all tasks NOT having a certain label.
You can achieve this with a search query such as this.
(tod & !@bigthing)
Adding the exclamation mark before the label does this.
This does not seem to work on Android. In Firefox/Windows it works fine.
We will add this option into our new Android app in future updates.