Stuck inside isolation mode

I've looked at multiple answers through the Adobe Support Community, online and etc. and nothing has worked for me so far. I was wondering if anyone could take a look at my file and fix it for me? I'm not entirely sure what has happened to it. I accidentally isolated a layer, turning the entire piece very tinted white, and since then I can't get back. 

I'm having issues uploading the file through this website for some reason, so here's a link to it through Google Drive: https://drive.google.com/file/d/1MJSKHVs2tNfqTHcN-eCEiR3d3pO0-Kyl/view?usp=sharing