The search for brand accounts is a feature that allows you to find businesses, companies or commercial accounts on Instagram. This feature is especially useful for creators who want to collaborate with brands. Select the "Search for brand accounts" checkbox in your search. Only accounts from companies, businesses and agencies will be displayed.
This will also allow you to find successful business accounts and get a glimpse of their social media strategy. Therefore, if this option is enabled, you will only see brand accounts and not influencer accounts.