This site is enabled for Safari web browser 'Reader' mode. Look for the reader line-icon on the upper left of the address bar of many topics.
Reader mode removes everything but the post content itself for an easier read. Tap the icon to toggle in and out of reader mode. The post must contain approximately seventy-five words before the reader mode icon will appear so you won't see the mode icon on all posts, just longer ones.
The Reader button for Safari on an IMAC is to the right of the browser address bar.
Chrome for Android has a similar 'Reader' mode feature. https://chrome.google.com/webstore/detail/reader-mode/llimhhconnjiflfimocjggfjdlmlhblm?hl=en
The Reader button on an IMAC is to the right of the browser address bar.