Check off/cross out (rather than hide/delete) icons of completed tasks

Every time I see a full icon, I think I still need to do the task. I prefer Structured over all other visual calendar apps except for this: I get so stressed when I open the app and immediately think I’ve done nothing because every icon of passed-time is so eye-catching.

A visual indicator on the task icon would make it clear the task is complete and should satisfy the users who don’t want completed tasks to disappear.

Visual indicators might include a check mark over the icon or fading and crossing-out the icon like is done with the text: