EWNAVVIEW_TREE_ATTR is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Navigation View: Tree Control Attributes" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_EWNAVVIEW_TREE_ATTR TYPE EWNAVVIEW_TREE_ATTR.
The EWNAVVIEW_TREE_ATTR table consists of various fields, each holding specific information or linking keys about Navigation View: Tree Control Attributes data available in SAP. These include NODE_SEL_MODE (Selection Mode (Single/Multi)), ITEM_SEL (Item - Selectable)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .