7. The Menus / 7.3 Functions in the View Menu
Zoom Out halves the current zoom factor. As a result the picture will be displayed smaller. The predefined shortcut of this function is "-" on the numeric keypad (on Windows) or Command+"-" (on macOS). Whether or not the window size will be adjusted, can be set in Options/Display, page Document (see chapter 7.10.1.26).