Why function completion doesn't fill brackets automatically?

[winkee01]

For example, in the below case, when I type fmt.Println,

and then hit Enter to confirm the completion selection, it becomes

However, this is not what I expected, I expected it to also fill () brackets for me, but it didn't, why?
Now I have to manually type (), which is very unpleasant.

[hrsh7th]

nvim-cmp is just behaves as Language Server's instruction.
You should re-check your gopls server configuration.

I think you sgould set it up 'usePlaceholders = true'

[bew]

Is it possible to force the completion engine to not follow what the server says?

[winkee01]

I tried 'usePlaceholders = true', it doesn't work.