There may be easier ways but I just use below to hide actions panel;

"add"=>false, // allow/disallow add
"edit"=>false, // allow/disallow edit
"delete"=>false, // allow/disallow delete
"rowactions"=>false, // show/hide row wise edit/del/save option

Refer docs:

$g->set_actions(array(
…
"rowactions"=>true,

)
);

You use it where?