This template's initial visibility currently defaults to autocollapse , meaning that if there is another collapsible item on the page (a navbox, sidebar , or table with the collapsible attribute ), it is hidden apart from its title bar; if not, it is fully visible.
autocollapse
To change this template's initial visibility, the |state= parameter may be used:
|state=
{{ Decades and years | state = collapsed }}
{{ Decades and years | state = expanded }}