Removing "Today" from a folder

Not sure how I did it, bt I returned to a folder and instead of the contents being in list form (which they are), but the contents show under
"Today"
"Earlier Today" &
"Last week"

I just want the contents in a simple list form.

What is the title at the top of the column?
I suspect one possibility is the grouping. Right click the white space in the folder and see if it states anything under "Group By"

great - thanks