Site seems stuck in responsive mode (tablet?) and Upload won't open

I have another open ticket for some issues I was having with Upfront on my site uniforendirect.ca, but now I'm having issues with the original site - uniforlive.ca. It seems like the site is stuck in one of the responsive modes (the layout is all messed up) but I can't edit it because when I click on Upfront it just goes to the live site.
Help!
With all these issues I'm tempted to start cleaning it all up and starting from scratch :slight_frown:
I have a major event starting tomorrow that needs the sites to be working.