Help! All my content widths have gone to Zero

Hi, seemingly from nowhere my entire site (including a massive online course) has had the width of rows default to zero over the entire site. I know I can fix each page manually and I have for the pages, but the course will take me forever to fix manually plus most of the content is now hidden so it’s a logistical nightmare working through it all to make sure everything is showing up. I’m desperate. I’m hopeful someone here can help. Thanks in advance.

I have changed global settings and that doesn’t help :frowning: