I can't say whether that is a custom layout or not. It is NOT the layout I normally use. I normally use custom layout to have the following columns:
Image
Description
Have
Want
Keep
Condition
(Don' tremember this column)
Serial Nbr (occasionally)
The point of the screen shot is to show that the option for Custom Columns is missing (not located to the left of the page numbers). At least that's where I remember it to be. The screen shot's layout is just what is currently showing, I did not change it to that layout.
Current browser is Google Chrome. I also tested with MS Edge.
Go to the right of "select" then click that arrow to see dropdown menu, make sure it is on "custom layout" That is where you will see what you're looking for.