This tab allows you to change any inserted symbols, modify their insertion points and mirror properties.
Entity Inspector - Symbol
Name
This displays the selected symbol's name. To choose a new symbol press the edit button 
. This will open the Symbol Select form. There is also a right-click context menu available from this field that allows you to copy the symbol name to the Windows clipboard.
Can optimise
Can explode
These two boxes simply display the settings assigned when the symbol was created. They cannot be altered.