so this here
https://www.gilesclement.com/
you can try this:
https://laytheme.com/documentation/gridder-rows.html#fullscreen-background-image
for having a fullscreen image
just set top frame and bottom frame to 0 and row height to browser height, then u cant scroll
if u want to hide the sitetitle on specific pages use css
please read this:
https://laytheme.com/documentation/custom-css-styling.html#css-based-on-current-page
this could be the css to hide your site title if the name of your homepage is "home"