The similar search starts from a creator you already know. Open the profile and go to the Similar Accounts tab. On Instagram it offers three views: Similar Creators, one ranked list that blends shared followers, audience lookalikes, collaborations and creators from the same niche, with chips on each row explaining why the account matches; Notable Followers, well-known accounts that follow this creator, sorted by their follower count (available once the creator's audience report is unlocked); and Collaborates With, accounts that have published co-authored posts with the creator. On TikTok and YouTube you get a single list of similar creators.
Clicking a result opens that profile, so you can chain from one good fit to the next; every suggestion can also be added to a collection directly. For Instagram creator profiles the tab additionally offers Open in Lookalike Studio, which uses the creator as a seed for a full lookalike list. Similar search is the fastest way to expand a shortlist once you have found one creator who fits your brand.