FRMLS_LAYOUT_COLUMNS 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 "Table Columns That Are Currently Displayed" 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_FRMLS_LAYOUT_COLUMNS TYPE FRMLS_LAYOUT_COLUMNS.
The FRMLS_LAYOUT_COLUMNS table consists of various fields, each holding specific information or linking keys about Table Columns That Are Currently Displayed data available in SAP. These include FIELDNAME (Table Column)... 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. .