Open the quick settings panel by swiping down from the top of the screen using two fingers. Then, swipe to and tap the Smart View icon.
Tap your TV from the list of "Available devices." Depending on the TV, you may need to enter a PIN or allow access to complete the connection. When you are done using Smart View, tap the Smart View icon on your phone, and then tap Disconnect.
Note: Make sure your TV is turned on and connected to the same Wi-Fi network as your phone. Some TVs may require you to switch inputs or turn on screen mirroring.
Thank you for your help I know how to connect smart phone and TV . I was able to mirror my phone screen to TV. in this morning, i tried to mirror my phone to TV as usual, but it doesn't mirror my phone screen and show me the screen like picture(which is "play content" option). I think there is a way to switch "play content" to "mirror screen" but I can't find where to switch this option
Hi jae0000, I suggest you to perform clear cache and data for smart view app on the phone then check if it works.
If you are still unable to mirror the TV, please try below steps.
Using your phone or tablet, open the SmartThings app, and select the TV you would like to mirror to. Make sure the TV is turned on and connected to your SmartThings account.
In the TV's setting page, tap More options (the three vertical dots), and then tap Mirror screen (Smart View). If needed, give your TV permission to access your device. Once that's done, your device's screen will appear on the TV.
