WordPress themes often contain additional page templates for static pages. These templates usually add certain features or layouts to a normal page when used.
Assign Page Templates
You can assign templates to a page on the ‘Edit Page’ screen which you find on your WordPress admin panel → Pages → All Pages → Edit Page or when you create a new page.
You should see a metabox ‘Page Attributes’ below the ‘Publish’ metabox, where you can select the template this page should use. If you do not see the ‘Pages Attributes’ metabox, check your screen options.
Do not forget to save your page by clicking ‘Update’ on the Publish metabox, otherwise your assigned page template is not saved.
If you have assigned a different template, WordPress will use that template to render the page. Depending on the selected template, it can happen that your page content is not displayed anymore.