Tap the Sort bar at the top of the list or choose ‘Sort’ in the menu. Choose one among the five sort orders: by modified time, by created time, alphabetically, by color, by reminder time.
Please note that if you close ColorNote app, the sort order will go back to the default sort order you set. To change default sort order, go to Settings and tap ‘Default notes sort order’ option. Choose one among the five sort orders: by modified time, by created time, alphabetically, by color, by reminder time, or choose ‘Last used sort order’. If you set ‘Last used sort order’ as the default sort order, the latest sort order you chose from sort bar will remain even after closing the app.