At the end of the novel, the reader has the sense that everything has been neatly explained. The confusing events of the attack are untangled. Boo is no longer the neighbourhood mystery and will continue to live his life the way that he perfers. Bob Ewell's death "equalizes" Tom Robinson's death. Jem's broken arm that was presented in the first chapter is finally explained. As Scout falls asleep, a calm falls over her and the reader. There is no indication that there are other questions that need answering.
Here is the summary of the conclusion/resolution of Lee's "To Kill a Mockingbird" from eNotes. You may find this and other summaries at the link below.
The denouement (ending) of To Kill a Mockingbird is a closed, settled one. There is nothing else to be resolved. All the conflicts are ended: Boo is a friend, Ewell is dead, Scout has given in to sleep, and for the moment the family is safe from society and its pressures.
The maturational motif is evident again when Scout says that “there wasn’t much else left for us to learn, except possibly algebra.” Scout has matured and has learned to stand in others' shoes. The repetition of a statement by Atticus is important here: “you never really know a man until you stand in his shoes.” This statement serves to weave Part One and Part Two together.