The Display Options tab is for each editor to be able to decide what they want to show in the stucture in Edit mode. There are two different settings. On the one hand you can choose system languages for the user. EPiServer CMS has 12 different languages as standard. This means that Edit mode and Admin mode will be in the language that the user has chosen.
It is also possible to choose which symbols will be shown in the tree structure. Sometimes there are a lot of symbols on some pages and it is possible to close them, for those editors that don’t need the symbols. Clear the Use default settings check box to select which symbols should be visible and which should not.
Editors can change these settings themselves under My Settings. These settings can also be made when the account is created.