Working on a playground website, I noticed that my sign-in page is nowhere to be found in the site navigation or in the list of web pages in the power pages management view. I don't understand how I could have deleted the page. However, if I did, is there a way to get it back or re-create the sign-in page from scratch?
Inside the Design Studio:

Inside Power Pages Management, I removed all filters so this should be all pages:

Do I have to recreate the site to get the sign in page back or is there a fix/setting that I can use to get the sign in page back?
Thank you!