KB: Specify options, such as template, of a single Draftsman document page rather than all pages
Altium Designer
[Why] Want to apply a setting such as template to a particular Draftman page exclusively and not on other pages [What] Changes made to the Page Options properties can be applied to the current page, or all pages in the document. [How] With nothing selected in the active page, in Properties panel, switch to Page Options tab. At the top-right of the panel, click to highlight the button 'Page Options for current page', and modify Page Options of your interest for a given current page.
Solution Details
Make sure that the Properties panel in its Document Options mode (active when no object is selected) has the Page Options for current page option enabled rather than the Page Options for entire document option. This option is located at the top-right of the panel.
When this option is enabled, you will be able to change page options (including its template) for the current page only.
ref:
https://www.altium.com/documentation/altium-designer/setting-up-draftsman-document#!page_options