Create a custom SearchWP settings screen tab

functions.php

<?php

// Add custom SearchWP settings tab
add_action( 'searchwp_settings_nav_tab', function() {
	if ( current_user_can( 'manage_options' ) ) {
		searchwp_get_nav_tab( array(
			'tab'   => 'custom', // tab name
			'label' => __( 'My Custom Tab', 'searchwp' ), // tab label
		) );
	}
}, 300 ); // priority controls placement of tab among other tabs