Use this if you are using igraph from R
An existing attribute with the same name is overwritten.
set_graph_attr(graph, name, value)
| graph | The graph. | 
| name | The name of the attribute to set. | 
| value | New value of the attribute. | 
The graph with the new graph attribute added or set.
Other graph attributes: delete_edge_attr,
delete_graph_attr,
delete_vertex_attr,
edge_attr<-, edge_attr_names,
edge_attr, graph_attr<-,
graph_attr_names, graph_attr,
igraph-dollar,
igraph-vs-attributes,
set_edge_attr,
set_vertex_attr,
vertex_attr<-,
vertex_attr_names,
vertex_attr
g <- make_ring(10) %>%
  set_graph_attr("layout", layout_with_fr)
g
plot(g)