Turn off dark mode in charts
I can't find the gear icon in Mail. I can't turn off dark mode in charts. Once again you have added a so-called feature without adequate testing. Charts in dark mode are useless to me. I can't see anything.

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pjmetz commented
Dark mode suddenly appears when I choose the RSI indicator. I was hoping I could turn it off in Mail by choosing the Appearance option. The other symbol (. . .) is hidden at the bottom of Folders on the left side. I have multiple folders. You must have the wicked witch of the west doing website design. Put mail settings on the upper left corner of the page and use a gear icon.
Sorry, I can't attach a screen shot. The Settings icon in Advanced Charts is a great place to put a toggle to switch between dark and light modes. Why didn't anybody think of doing this or was it just too convenient or intuitive? Perhaps your management doesn't want to pay for usability testing, but your website sorely needs it. I use the Safari browser.