Pages and Posts in Classic are created as is standard for Jekyll.

There are some additional front matter tags though:

• comments: When a disqus account is available, setting the comments to yes will enable the disqus comment section.
• secondary-column: This is an override setting of the general parameter in site.data.setup.secondary-column. Set this to either none, right or left to affect the placing of the secondary column for this page/post only. Note that disabling the secondary column when the drop-down menu is disabled (i.e. site.data.setup.drop-down-menu is set to no) will result in the loss of the vertical menu.
• tertiary-column: This is an override setting of the general parameter in site.data.setup.tertiary-column. Set to either none or present to affect placing of the tertiary column for this page/post only.
• secondary-column-content: By default the content for the secondary column is taken from _includes/secondary-column.html. Assigning it a different file here will override this default for this page/post only. However if the vertical menu is used (i.e. site.data.setup.drop-down-menu is set to no), it will remain visible at the top of the content of the secondary column.
• tertiary-column-content: By default the content for the tertiary column is taken from _includes/tertiary-column.html. Assigning it a different file here will override this default for this page/post only.