format issue halfway through imported doc

Hello,
First time user of Scrivener this weekend and first-time poster here! Be gentle.

I’ve imported some work and I’m going through the whole thing splitting it into scenes and chapters etc.
That is until I came across a problem halfway through my doc.

It’s gone into some kind of column format? I’m not even sure that’s what it is?

I’ve tried realigning and also just manually trying to move the text, but the whole of the rest of the doc is like this? Like it’s a narrower page than previously?

Please see attached (Image abstracted as its a WIP)

Any advice? I’m hoping it’s something really easy to fix!

FIXED

It was a ruler issue! Leaving this up in case it helps anyone else