Hide completed tasks
For multipart projects, Todoist becomes difficult to use because all the completed tasks remain, grayed out. While it is good that they're still there, so that the user can see what's been done, this makes it more difficult to locate open items at a glance. I'd suggest adding an option to hide completed tasks. That way, users can bring them up if they need them, but can limit the view to open items, which is more likely to be the focus going forward.
Agreed - Please implement this.