Full width template option not available - Wordpress

Hi!
I noticed that I no longer have the option to choose between “Full Width Clean Page” or “Side Navigation” when I create or edit a page on Wordpress. Does anyone know why this is happening? I am trying to make a full-width portfolio.

Thank you.

You will need to contact the author of the theme you bought as only they will really know what’s gone wrong in your installation of their theme.