Update:
I have copied the entire contents of loop-page.php to a new template file. Apparently the sidebar is part of the footer code, so I removed
get_footer();
from the bottom and that did away with the sidebar. (and the footer, but that is doable, I guess)
I commented out the
‘ <?php //the_content(); ?> `
and put my javascript below that.
Now the sidebar does not show, but the area where the sidebar was is still there. I need the content section to be 100% width, but cannot figure out how to do that. Ideas?