remove fill color levels from a ggplotly legend

Question

Is there a way to remove the fill color from the ggplotly legend since it is redundant with the facet? In other words, it's true that I essentially have four combinations, but I only want to show the levels of alpha in the legend because the faceting tells you the same information as the fill values. I don't need to explain what red and green mean since red only applies to facet group3==0 and green only applies to facet group3==1 .

---
title: "Example"
runtime: shiny
output:
  flexdashboard::flex_dashboard:
    vertical_layout: fill
---

```{r}
  library(tidyverse)
  library(plotly)
  library(flexdashboard)
```


### Chart 1

```{r}
  f <- list(family = "Poppins")
  a <- list(tickfont = f)

  p <- fortify(forecast::gold) %>%
       mutate(group1 = sample(0:1, n(), replace=TRUE),
              group2 = sample(0:1, n(), replace=TRUE),
              group3 = sample(0:1, n(), replace=TRUE)
              ) %>%
    ggplot(., aes(factor(group1), y, alpha=factor(group2), fill=factor(group3))) + 
         geom_col() + 
         scale_alpha_manual(values = c(.5, 1)) +
         facet_wrap(~group3)

  ggplotly(p)
```

Answer 1

I arrived here from google because a ggplot that didn't have a legend was being given one when ggplotly() was called on it.

In case that affects anyone else, the answer is, use:

theme(legend.position='none')

as plotly understands that.