Layout // how to add a full width page

Hi folks,

01 Enjoying Tienda a Lot.

02 I’d like to have a full width page on it, I’ve used the instruction I could find here (https://premium.wpmudev.org/blog/create-full-width-page/?utm_expid=3606929-101._J2UGKNuQ6e7Of8gblmOTA.0&utm_referrer=https%3A%2F%2Fwww.google.co.il%2F)
but they don’t seem to work – – – I got an ok page without a sidebar, BUT it’s full width, no matter what I do.

Is there something you could help here PLEASE?

THANK YOU
??