how to use alphabet search for contacts

Hey maryannfromaurora,
Keeping your contacts in the order your prefer makes it easier to find the contact you need. I'd be happy to help with that.
The article below will help with managing your contacts in your iPhone X:
Manage and delete contacts on your iPhone, iPad, or iPod touch - Apple Support
Specifically, let's look at the steps in that article that help you set up how your contacts are listed:

Change how you sort and display contacts

You can choose how to sort your contacts, like alphabetically by first or last name. Just go to Settings > Contacts and choose from the following:

• Sort Order: Sort your contacts alphabetically by first or last name.
• Display Order: Show contacts' first names before or after last names.
• Short Name: Choose how your contact's name appears in apps like Mail, Messages, Phone, and more.