Review on 4K Portable Dock - USB C to HDMI Adapter with PD Charger, QCEs USB-C Multiport Hub for Samsung Dex Station, Galaxy S20, S10+, S9, S8 Plus, Note 10/9, Tab S4, MacBook Pro/Air 2019, iPad Pro by Reid Rickerson

My S9 only mirrors my phone's screen. This button does not go into Dex mode. Someone here gave a good review and acknowledged it's just a mirror. This is not the same as Dex mode! Another reviewer said you can toggle the HDMI connection switch on the S9 from Mirroring to Dex. My phone doesn't have this setting. I also don't get a notification allowing me to launch Dex. I have mirroring and all and that's not why I bought it. False advertising!