I am assuming – Page template you are using is “Default”
Now follow these steps :
1. Make an copy of page.php, name it “no-sidebar-page.php” (you can give any name ?? )
2. Open newly created file “no-sidebar-page.php” put this comment on top of page after under <?php
<?php
/*
Template Name: No Sidebar
*/
3. Now find there could
get_sidebar
function. Delet that function and see the results.
4. Assign this template to those page where you don’t want to show sidebar.
(You may need to change a bit HTML markup too)
All done ??