I don’t have a search bar on emojis keyboard. How can I turn it on?

If you have other keyboards installed (like Gboard), they might be overriding the default emoji keyboard behavior. Try temporarily removing them and see if the search bar appears.

If you feel you have tried everything then...

Get a Genius Bar Reservation and Apple Support Options - Apple

When you encounter issues with your Apple devices, the Genius Bar at Apple Retail Stores is the go-to place for expert assistance. The Genius Bar is staffed by knowledgeable Apple employees, often referred to as "Geniuses," who can diagnose and resolve a wide range of hardware and software-related problems. To ensure personalized attention and a convenient visit, Apple provides the option to schedule a Genius Bar Reservation.

Contact Genius Bar.

Manage Reservations - My Reservations - Apple

milica998 wrote:

Im pretty dissapointed because of these random bugs..

If you believe you've discovered a security or privacy vulnerability that affects Apple devices, software, services, or web servers, please report it to the ...

Bug Reporting - Feedback Assistant

It is not clear from your post what is seen by you on your device. See the Search emoji field seen on my device for Notes, Messages, Email, Reminder and Maps (Refer to the pic below)