Disable Default Page Extension
When new pages are created in a site, the default page URL is constructed with an .html extension. You can disable this so that new pages are constructed without any extension.
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Click Sites in the side navigation.
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Select the site and choose Properties from the right-click menu or click Properties on the actions bar.
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Click SEO in the properties sidebar.
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Click Include '.html' extension to toggle the default extension off.
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Click Save to close the panel.
Changing this value will only affect new pages. URLs of existing pages within the site are not changed.