Gather all tasks

Hi, is there a way to see all tasks that are incomplete? I mean all checkboxes?

I found another thread from some time ago from a usea that was assigning himself a task, however, whenver I do this and then I try to search for tasks assigned to me I cannot see any results. So basically I have a task which is assigned to me, whenever I search in the list containing that task, it appears through search, but when I go Enter Enter to search all lists, i get the “no results found” message.