How do I show All Files under the current folder?
MacOS used to come with a feature called "All My Files", which did indeed show you ... all your files. But it was removed in High Sierra -- quite probably because showing you 500,000 files (as the result of a live search query) in one window would cause significant slow down.

All My Files was replace with "Recent", which shows you all the files created or modified within 1 day. You can modify this search, or create your own Smart Folder.


Create a New Smart Folder in Finder's File menu. 
Add criteria for "Created Date" and "Content Modified", both to be within some all-inclusive value, like "within the last 35 years". 


You can then display the results in a list and sort by date.