Mat Smith / Engadget Beginning this week,  Galaxy 26 owners can test drive One UI 9, built on Android 17 . New features include a Quick Panel redesign and new creative options for Samsung Notes. Try to contain your excitement. Accessibility features may be the highlight.  One UI 9 beta includes something that folks who rely on external keyboards will appreciate: the ability to adjust the mouse key speed. There's also a new feature called Text Spotlight that lets you zoom and clarify selected text inside a floating window. And TalkBack, Samsung's screen reader with text-to-speech (TTS) tech, is now integrated with Google's feature of the same name . There's also a neat new security feature: One UI 9 could help you to avoid installing malicious apps. The software can detect high-risk apps, warn you about them, and block their installation. The rest of One UI 9's new features are, shall we say, a bit ho-hum. Among them is a new Quick Panel layout.…