In the lists tasks screen if you click on the maximize icon, the page will open up full size hiding the top panels.

In the lists tasks screen if you click on the restore icon, the screen will revert back to actual size.

When in Edit mode of the list tasks screen, click the maximize icon, this will then take up the entire browser page.  

To minimize to edit list tasks screen select the minimize icon to bring the window back to normal size.

When in the event list tasks panel, select the maximize icon as shown below.