I am not sure which chart you are using. So I am giving you here an example with a table chart.
There is “Number Format” option provided in the chart advanced settings for each chart. There you need to put #.#### like this – http://prntscr.com/lj0igd.
Also, the data provided should be in number format – http://prntscr.com/lj0ing.
After these two settings, the chart shows four decimal points to me – http://prntscr.com/lj0irg
Hope this helps achieve you the same.
thank you for your answer, Vishakha
Candlestick chart doesn’t have this option
Plugin Contributor
Madalin
(@madalin_themeisle)
Hi @paulsam79,
Thank you for coming back to us with these details. At that moment this feature is not available on the candlestick chart because in that way was created.
I have added that to our developers as a suggestion. Keep in touch!