Sounds like this might be a setting in RStudio, if you're using that.

If in RStudio: tools -> global options -> appearance -> customize.

On Wed, Jan 14, 2026 at 12:06 PM Andre Luiz Tietbohl Ramos <
[email protected]> wrote:

> Hello,
>
> Is there a way to customize quantmod theme colors?  This great library
> works fine however I rather change its color theme.  So far, I have been
> able to use both white and black themes.
> I tried to use the chartSeries theme command described below to no avail.
> I tried even without a theme name, e.g. white or black. An example is
> below,
>
> stock.plot <- chartSeries(stock.time_interval,  ## ativo,
>                           name = stock.name,
>                           type = "candlestick",
>                           subset='2025-07::2026-01',
>                           theme = chartTheme("white", up.col='darkgreen',
> dn.col='darkred',
>                                              bg.col='gray',
> selection.color='gray'),
>                           TA = NULL
>                           )
>
> Could anyone help, please?
>
> TIA,
>
> --
> Andre Luiz Tietbohl Ramos, PhD
>
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>
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