My account page, don’t show the complete “Registration form”

By default, it shows like this, but if you want to add more options like “Name, Phone number, Email” option in the registration form, you have to follow these two simple tips:-

Step 1: Enable the Customer Registration Option

Step 2: Add Custom Code in Functions.php File

function wooc_extra_register_fields() {
    ?>
    <p class="form-row form-row-wide">
        <label for="reg_billing_phone"><?php _e( 'Phone', 'woocommerce' ); ?></label>
        <input type="text" class="input-text" name="billing_phone" id="reg_billing_phone" value="<?php echo isset($_POST['billing_phone']) ? esc_attr($_POST['billing_phone']) : ''; ?>" />
    </p>
    <p class="form-row form-row-first">
        <label for="reg_billing_first_name"><?php _e( 'First name', 'woocommerce' ); ?><span class="required">*</span></label>
        <input type="text" class="input-text" name="billing_first_name" id="reg_billing_first_name" value="<?php if ( ! empty( $_POST['billing_first_name'] ) ) esc_attr_e( $_POST['billing_first_name'] ); ?>" />
    </p>
    <p class="form-row form-row-last">
        <label for="reg_billing_last_name"><?php _e( 'Last name', 'woocommerce' ); ?><span class="required">*</span></label>
        <input type="text" class="input-text" name="billing_last_name" id="reg_billing_last_name" value="<?php if ( ! empty( $_POST['billing_last_name'] ) ) esc_attr_e( $_POST['billing_last_name'] ); ?>" />
    </p>
    <div class="clear"></div>
    <?php
}
add_action( 'woocommerce_register_form_start', 'wooc_extra_register_fields' );

if you want to do this using plugins, then you should read this article “How to Add Custom WooCommerce Registration Form Fields“.