Restore old To-Do list behavior (strike-through for done tasks)

Description:
Earlier this year, when I marked a task as done, it disappeared from the main list but stayed visible with a strike-through in the task view. Now, checked tasks vanish completely unless I enable “show completed tasks,” which makes the list cluttered.

This change is very inconvenient—if I accidentally mark something as done, it’s gone, and I have to change settings to find it again. Please bring back the old strike-through option for completed tasks.