A few important settings in the User Interface settings are explained below
Enable Collapsible Sidebar
Allows end-users to collapse sidebars.
Enable New User Interface Theme
For all end-users, new look-and-feel is enabled
Enable Inline Editing
Allows editing of fields in records detail page, without going
into the Edit page.
Enable Hover Details, Enable Related List Hove Links
Hover or tooltips provide additional information when
mouse is placed on an item. These options are used to
display record details and display more items in Related List.
Enable Enhanced Lists
Provides advanced feature in list view like drag-and-drop
and display record count
Enable Printable List Views
If enabled a print icon is added to the List page.