In Planner, when Creating new Tags, you have the option to set a Tag as a Priority Task. To create a priority tag, start by creating a New Tag Card by clicking on the '+ Add Tag' button in the Tag Shelf. In the New Tag Card, simply Check the 'Priority Task' option. Fill out the rest of the Tag and click 'Add' to Save the Tag.
With the tag set as a Priority Task, it will show on on the board as a priority tag with a red indicator in the bottom right corner of the Tag as shown below. The priority on the tag can be set or removed by editing the tag and checking/unchecking the Priority Task option.
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Last Updated: Feb-17-21