I wanted to figure out how "Starting" works and the internet told me about a new resource for the game: The Grimoire. It's the new online rules document for 2026 and beyond, found at this url:
Grimoire
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Here's the entry in the Grimoire for Starting:
Starting
Starting is a keyword ability.
After drawing their opening hand and taking a mulligan (but before shuffling any cards that may have been set aside during this step back into their deck), an investigator may search their deck for one copy of a card with the starting keyword and add it to their hand.
• This means that an investigator may begin the game with one additional card in their opening hand.