Full Width (Posts & Pages)

Is it possible to have Posts full width in this theme? I’d like to really let the images sing (I use the NextGen plug-in). The option doesn’t seem to be available at the minute.

Also – there is a full width option for Pages but while the text does, the images don’t stretch the whole length.

Is it possible to get Posts full width and the images on Pages full width?

Here’s the website: https://www.belgiansmaak.com/belgian-family-brewers/

Thanks,

B