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Copilot , i have a question regarding SAMSUNG DeX software and i hope you can give me a good answer ! Being a Senior Citizen and a Grandpa of 70 years old , i have always wanted to purchase and have and possess and own a 15.6 inches 5G smartphone but sadly the 5G smartphone maunfacturer are not making it . I have been for so many years a strong advocate of the 15.6 inches screen size , regardless whether it is a Laptop or a Tablet or a Smartphone or a Folding Smartphone . For a Senior Citizen like me , a 5G Folding Smartphone (regardless whatever the design methodology is) that can unfold into a 15.6 inches Tablet is SOOOOO AWESOME because it can serve and emulate like a 15.6 inches Laptop , it can serve me as a 15.6 inches tablet and BEST OF ALL it can be a 15.6 inches 5G smartphone .........a huge 5G smartphone whuich is very easy on my eyes and when it comes to typing emails , WhatsApp , Instagram , Facebook , etc., etc., etc., IT IS A MUCH MORE ACCURATE EXPERIENCE BCAUSE OF THE LARGE 15.6 INCHES SCREEN SIZE . Having said that , since the 5G smartphone manufacturer are not making 15.6 inches 5G smartphone , i have plans to create a simple 15.6 inches 5G smartphone . It is a simple DIY project to emulate a 15.6 inches 5G smartphone. The idea is something like this . I have purchased a 15.6 inches Touchscreen External Monitor and i would like to connect that 15.6 inches Touchscreen External Monitor to a SAMSUNG Galaxy Note 20 5G smartphone which comes with SAMSUNG DeX , so that the output of the SAMSUNG DeX software will output the Display to my 15.6 inches Touchscreen External Monitor , MAKING IT LOOK LIKE I AM HAVING A 15.6 INCHES 5G SMARTPHONE . But Copilot , what worries me most is that , is the SAMSUNG DeX software on my SAMSUNG GALAXY Note 20 5G smartphone ......... CAN AUTO-ROTATE OR NOT ????!!!!! The idea , is so that i can work on my my 15.6 inches Touchscreen External Monitor in PORTRAIT MODE and in LANDSCAPE MODE . Copilot , it would be useless if i cannot do that because it defeats the purpose of emulating a 15.6 inches 5G smartphone IF THE SAMSUNG DeX software on the 15.6 inches Touchscreen External Monitor CANNOT AUTO-ROTATE TO LANDSCAPE MODE OR PORTRAIT MODE ! Copilot , what do you think regarding this idea of mine ? Copilot , do you think this idea will work in order for me to emulate a 15.6 inches 5G smartphone using SAMSUNG DeX software and with the help of the SAMSUNG Galaxy Note 20 5G smartphone ? Copilot , could you please shed some light or give me any ideas regarding this interesting DIY project in order to get the feeling of a 15.6 inches 5G smartphone ??? THANKS for your answer.
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Samsung DeX on the Galaxy Note 20 5G does not currently support auto‑rotation into portrait mode when connected to an external monitor — it is locked to landscape orientation. This means your DIY project will work for emulating a large 15.6‑inch smartphone in landscape, but portrait mode rotation is not natively available in DeX.
🔍 What This Means for Your DIY Project
Landscape only: DeX is designed as a desktop‑like interface, so external monitors default to landscape.
Portrait limitation: Many users have requested portrait mode, but Samsung has not added it yet for DeX on phones.
Workarounds:
Smart View: Wireless casting supports rotation, but your external touchscreen monitor may not support Miracast.
Auto Rotating Accessory: Samsung TVs with this accessory can rotate automatically, but this doesn’t apply to portable monitors.
Manual rotation: Some monitors allow you to physically rotate and then adjust orientation in their own settings, but DeX itself won’t adapt.
⚙️ Practical Setup for Your 15.6‑Inch Monitor
Connection: Use a USB‑C to HDMI cable from your Galaxy Note 20 5G to the monitor.
Touchscreen support: If your monitor supports USB touch input, connect it via USB‑C or USB‑A to the phone for touch functionality.
Keyboard/mouse: For best usability, pair a Bluetooth keyboard and mouse.
Power: Keep your Note 20 plugged into fast charging while running DeX to avoid battery drain.
📐 Why Your Idea Still Works
Large screen advantage: Even locked in landscape, a 15.6‑inch monitor gives you the “big smartphone” feel — easier typing, clearer text, and less eye strain.
App usability: Most apps are optimized for landscape in DeX, so you’ll still benefit from the larger workspace.
DIY spirit: Your project cleverly bridges the gap between what manufacturers don’t offer (a true 15.6‑inch smartphone) and what you can emulate with existing tools.
⚠️ Limitations & Risks
No portrait auto‑rotate: You won’t get the vertical smartphone feel unless Samsung updates DeX.
Touchscreen quirks: Not all external monitors’ touch drivers are fully compatible with DeX.
Future updates: Samsung may eventually add portrait mode, but as of now, it’s not available.
🧠 Copilot’s Take
Your DIY project is absolutely workable in landscape mode and will give you the immersive 15.6‑inch smartphone experience you’re after. The only missing piece is portrait auto‑rotation, which DeX doesn’t support yet. If portrait is essential, you’d need to explore Smart View casting or a Samsung Auto Rotating TV accessory, but for your external touchscreen monitor, landscape is the reliable option.
Would you like me to walk you through a step‑by‑step guide for connecting your Galaxy Note 20 5G to a 15.6‑inch touchscreen monitor with DeX so you can start testing your DIY setup right away?