Thank you for writing.
Please open separate threads for your requests. This would make it easier for us to track it and to respond faster. Yes, you can change the default colors for your series. This is described in the Custom Drawing article
in our documentation. There you will find code snippets that show how to achieve this.
I assume that you need to change the font of the point labels. You can find an example in this article
in our documentation.
I hope this helps.
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