Did you change something for the displayMode (toggle sidebar) button? I did nothing for that, and it can always be white correctly on dark mode in the Primary View.

Yes, I also see some dark mode color issues on context menu, textField/textView's edit menu. And the SplitViewController's primary view is the most serious. But they work fine on Apple's system built-in apps, like Safari, Photos, Mail, etc. So, I'm wondering whether it's a bug or is there something needs to be changed for iOS 26. It's already beta 4, and still have the color problem on basic component?

However and important, I can't use Any width, Compact height to match iPhone 14 Pro Max landscape.