There are several places where I believe improvements can be made to the layouts on the backend of Omeka S.
Under the Sites section, when you look at the sites you have, the LAUNCH, EDIT (pencil) and Delete icons are WAY too close. I believe the trash icon should be moved far away from these other options.
On the items page, the make private directly follows the name of the item. It would be better to place this in a column perhaps proceeding the item name so it is easier to see. I would also suggest allowing it to be clickable from this page so that items may be quickly made private or public.