I don’t want the forum to dictate how I use the iPad.
Sure, I was just curious as much as anything. The issue here then is that the desktop version of the site isn’t rendering correctly on Safari for iOS. You can see the two different site views in your screenshots.
Whether the forum presents the desktop or the mobile site is decided on browser width, IIRC the threshold is 1000px. (You can see this in action on a regular computer if you resize the browser, beyond a certain point it’ll suddenly switch.)
Weird that it’s switching as you change orientation, unless it’s a 10 year old iPad Mini. 🤷♂️ Maybe there’s something else I’m unaware of which also triggers the switch.