Colapse All Button for Tasks Lists

I have many tasks, and I have several task lists, when I open a task list that for example has more than 50 tasks, the screen becomes so polluted that it is annoying to scroll down to another task list, and when more than one task list opens with many tasks? it drives me crazy. A simple button above all the task lists would be great for me. Because I end up getting lost with so many things on the left side of the screen.