I really love the whole page designer concept, but I wish I was able to link to a specific record.
The current implementation seems broken: when adding the record to the page designer URL, it expands the linked record instead of just changing the record shown in Page Designer itself.
Example: Airtable - Binaural Database Catalog
This URL should load the Portal view, but instead it expands it, while the wrong/default record (in this case, Half-Life) is shown on the Page Designer view behind it.