Set up the page title and social preview

Open the Props tab. You don’t need to select anything.
Under Page settings, expand Title & description.
Type the Title. Keep it under 60 characters — the counter turns red above that.
Type the Description, about 155 characters, as you’d like it to appear in search results.
Expand Social sharing and fill in:
- og:title and og:description — usually the same as the title and description.
- og:image — the full address of a 1200×630 image.
- og:url — the page’s public address.
- twitter:card — summary_large_image for a large image preview.
Expand Language and set lang, for example en.

Common variations

Hide the page from search engines. Under SEO, set Robots to noindex, follow.
Same content at another address. Under SEO, set Canonical to the preferred address.
Translated versions. Under SEO → Language alternates, add one entry per language.

A setting doesn’t stick when cleared. Clearing a field removes its tag from the page; that is the expected way to remove a setting.