How to have “a” removed from a ggraph plot legend?

Question

Can the letter \"a\" be removed from the legend associated with e.g. a fill or colour aesthetic, in a ggraph network plot, like in the

Answer 1

Answer to the original question based on comments above: The following line of code has to be added on the top of the script as per @user20650 solution.

library(grid)
GeomLabel$draw_key <- function (data, params, size) { draw_key_rect(data) }

If repel = TRUE argument is used inside geom_node_label, then in addition to the above GeomLabelRepel$draw_key <- GeomLabel$draw_key needs to be added.