uploads – Place large image into a post to go full width of its container

I’d like to insert a huge infographics image into a post. The problem I’m facing with is that WordPress provides smaller versions of the image even though I choose “large” thus the image won’t go full width of its container and smaller texts in the image are not readable.

In the image details, the full size option isn’t the original full size, but smaller. I’d need an option for 960px width.

display settings

I noticed that WP uses srcset & sizes to make images responsive. Is it possible to override/customise it? Or how should these kind of large images be displayed?