Thank you for posting in the Community, gjendras.
That suggestion is designed to remind users to choose the most frequent category based on your historical choices. At the moment, we're unable to change, but I'll bring up your suggestion to our product engineers. That way, they can consider adding an option to remove it, or at least change the suggestion.
On the other hand, you can also set your favorite locations for an easier way to categorize your mileage entries.
Please don't hesitate to comment below if you have other questions.