Hi,
You can hide the SELECT ALL / DESELECT ALL as below
DATA lo_model TYPE REF TO cl_salv_wd_config_table.
..........
lo_model = lo_interface->get_model( ).
.......
lo_model->if_salv_wd_table_settings~set_selection_mode(
EXPORTING value = cl_wd_table=>e_selection_mode-single ).
Hope this helps you.
Regards,
Rama