Hello Justin,
Thanks for posting in!
1.) The highlight or the bottom border color in the menu item if it is active or when you hover it, is actually the same color as your link hover color. You can change it in X > Theme Options > Typography > Site Links. You can use the color selector to change the link hover which will also change the color of the highlight or the border of the menu item hover.
2.) By default, you cannot add a search form widget in the navbar. You can only add a search icon in your menu navigation. You can enable it in X > Theme Options > Header > Search. This setting will allow you to activate search functionality for the navbar. If activated, an icon will appear that when clicked will activate the search modal.
3.) This will require search form template modifications. Since you have your child theme active and ready, please follow these steps below:
-
Using Notepad or TextEdit or Sublime Text or any text editor, please create a new file in your local machine.
-
Insert the following code into that new file:
<?php
// =============================================================================
// SEARCHFORM.PHP
// -----------------------------------------------------------------------------
// Template for displaying search forms in X.
// =============================================================================
$input_atts = apply_filters( 'x_search_input_atts', array(
'class' => 'search-query',
'placeholder' => __( 'Looking for something?', '__x__' )
) );
?>
<form method="get" id="searchform" class="form-search" action="<?php echo esc_url( home_url( '/' ) ); ?>">
<label for="s" class="visually-hidden"><?php _e( 'Search', '__x__' ); ?></label>
<input type="text" id="s" name="s" <?php echo x_atts( $input_atts ); ?> />
</form>
We would love to know if this has worked for you. Thank you.