Hi @Yang-Lun Liu you can't change the order of boards unless you star them. You can drag-and-drop starred boards in to whatever order works best for you so that you can easily find the boards that you need to access the most. There is no limit to the amount of boards that you can star. Hover your mouse over a board tile to and click the star to star a board.
Please let me know if this answers your question.
Have a great day!
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