Hi Anjua kumari,
i think that popup calling standard means there is some sort of function setting will be there.
if you observe cl_crm_uiu_bt_action_tools=>get_actions_popup_by_adminh( ir_adminh = lr_entity ir_wd_manager = me->comp_controller->window_manager ).
this class is calling method in that method there is another method is calling
rr_action_popup = get_instance( )->get_action_popup( ir_adminh = ir_adminh ir_wd_manager = ir_wd_manager ).
in that atlast there are passing one table type that is
mt_ppf_actions table type this action are predefined i think that might be coming through functional settings in spro.
i may not sure about this but i think this is the one way we can remove that popup items.
and ask to your function person how this action popup is displaying is there any setting have you done.
go to this path
spro->crm->basic function->actions.
Thanks & Regards,
Srinivask