plugins - how do i fixe Page Builder on a custom page?

hi i create a theme from scratch for wordpress (with header and footer) i did my home-page but for the other page i wanted to keep the header and the footer and using Page Builder for the content but its seem i cant display the Page builder here the code of my custom page :

<?php /* Template Name: CustomPageT1 */ 
 get_header();
 ?>

<?php
get_footer();
?>

so i keep the header and the footer for the page but won't display the page builder element

how can i fixe this issue thanks