Type the format in "'task content', 'task category';" for each items in the to-do list. Can type the items more than one. Then click "Add" button. 'Task Category' List is on the right.
Click the content in the list once to add strike line, click it again to remove the strike line.
Double click the content to remove it.
Press "Toggle" to hide the content with strike line. Press it again to show the hidden content.