Section cuts: how to remove bold red lines

Im currently completing a floor plan for the Institute of Interior Design. I have done a section cut of my model to create a floor plan. However on the section cut most of the lines are a bold/thick red line. I’ve tried going to view and un-ticking “section plane” and “section cuts” - both of these however revert my model back to the uncut model i.e. full heigh walls (without a cut showing windows, doors etc). Am hoping someone can help (image attached)…


You can adjust this in the Style dialog.