How to interpret the progress indicator on the Form2

I’m a new Form 2 user and am wondering how to interpret the circular progress indicator on the touch screen while the machine is printing. Apologies if it’s already posted somewhere but I couldn’t find it.
I guess the outer blue part is the overall progress, right? I initially thought that the inner white circle represents the current layer but sometimes a sweep takes place before it’s completed, so I’m not sure any more. Or does the machine sometimes sweep while it’s still busy with a layer?

I believe it is layer inside total progress.