property ExFileView.ShowFocusRect as Boolean
Retrieves or sets a value indicating whether the control draws a thin rectangle around the focused item.

TypeDescription
Boolean A boolean expression that specifies whether the focusing file or folder shows a dotted rectangle around.
By default, the ShowFocusRect property is True. For instance, you can use the ShowFocusRect property on False, if the SingleSel property is True, or using EBN to show the control's selection. Use the SelBackColor property to specify the background color for selected files or folders.

The following screen shot shows the one focused item ( ExData ), and 2 selected items (COMMON and HOW-TO-Before):