Go to Admin>Appearance>Layouts

On the left create a Bestseller module and then once you create it, click an drag it into the area you want it to appear.
Note that once you place it in a block it defaults to the last spot, so you can then drag it up above or in between the others in the same block.

Breck

No...that is not the problem. This is not on the customer pages but in the Admin Dashboard. In the Sales and Products
panel the Recent Orders and Most Viewed lists work but neither the Best and Less Sellers lists. They are empty. Why is this, please?

They appear on my site. Are you up to date?

As noted before... Arastta 1.6.1 Stable I don't think they ever have shown up.

Does anything display in your "Analytics - Sales" in your Admin Dashboard?

It's dependent on your settings, and order handling, for completed orders: https://github.com/arastta/arastta/blob/master/admin/model/dashboard/recenttabs.php#l15

Check your "Checkout" section in: https://arastta.org/docs/user-manual/system/settings/option

Thanks Rune. Setting Settings/Option/Account - the top three of Online, Active and Searches - on has kicked the lists into life. I presume I will have to wait a few days to see other products appear.

The main graph band is odd too - but perhaps that will now track more too. Thanks.