if ( true === is_page_template( 'xyz.php' ); ) {

    get_sidebar();

}

Although if your templates are selectable from the edit page screen in the Page Attributes section (where you edit the page content), then simply having two separate templates, one with a sidebar and one without would be fine. No need for an if statement like above.

I need to disable the sidebar on the front-page.php for the no-sidebar.php template ONLY and leave the sidebar in place for default templates.

<?php if(is_home() && is_front_page()): ?>
<?php endif; ?>

Thanks.

The front-page with the no-sidebar template applied now has no sidebar, however it is not pulling in the full width aspect of the no-sidebar page template now ??

	<?php if (is_page_template('front-page.php' && 'no-sidebar.php') ) : ?>
		<div id="primary" class="content-area-no-sidebar">
			<main id="main" class="site-main">
	<?php else : ?>
		<div id="primary" class="content-area">
			<main id="main" class="site-main">
	<?php endif; ?>

I don’t know how best practice this is but it works!

Thanks everyone.