Add this script to Pantallas object. It should work:
GameObject[] allChildren;
void Start()
{
allChildren = GetComponentsInChildren<GameObject>(); // find by code or add objects in Inspector
}
void ActiveChildren(bool show) // you can active and deactive in one function
{
foreach(GameObject child in allChildren)
{
if(child.name != "Mapa") { child.SetActive(show); }
}
}