The documentation for bookdown features are in the Bookdown book so this chapter
I don't understand what does not work ?
As documented, you can use a function to modify the Caption label that is otherwise hard-coded in Bookdown. For figure, it is by default Figure
In the reference part, only the number will be output when you render. So it is up to the author to add the prefix desired.
For example
```{r nice-fig, fig.cap='Here is a nice figure!', out.width='80%', fig.asp=.75, fig.align='center'}
par(mar = c(4, 4, .1, .1))
plot(pressure, type = 'b', pch = 19)
```
see \@ref(fig:nice-fig).
will output
As you can see it is only the number. The author can write anything before.
The opened issue suggest to add a feature to use the label also in the reference directly.
Please, can you give an example of what is not working compared to what is documented ?
thank you.