OK that series is using Xcode 11 and there are some subtle differences with the Xcode 12 interface as you have noticed but all of the functionality is still there. For example where Chris Ching is showing you this Xcode 11 screen and referring to the top right 3 icons like this:
The two that I have circled now appear like this:
So yes, Apple moved them. The button in the middle of those 3 (which was to activate the debugging console) has been removed but to get that window open you can press Shift + Command + C.
The other two buttons - the one with the + and the other with the two opposing arrows are the same.
When you initially created your example project you would have also noticed some differences with the opening Application platform selection screen. Xcode 11 looks like this:
and Xcode 12 looks like this:
Chris refers to building a single view App so in Xcode 12 you make sure that you select iOS as the platform and select the App icon as the Application type that you want to build.
On the next screen there are differences too… yeah it’s a bit confusing for newcomers but you’ll get the hang of it…
Xcode 11 looks like this:
and Xcode 12 looks like this by default:
The key to this is that for a Storyboard (or UIKit) project, which is the subject of the tutorial you are watching, you change the “Interface” option to Storyboard and I see you’ve got that part sorted out because the files on the left hand project navigator panel in your earlier screenshot match with what I would have expected to see.
Hope that helps.