Android App scaling issue using Samsung Dex

[ArnoTlse]

Describe the bug

I use primarily my Android Smartphone to flash and tune my quad using betaflight. However, when I'm at home, the display of the smartphone is quite small to be efficient. It is good on field to change something quickly, but when you need to flash and make several modification, it is not very pratical.
It is where I try to use betaflight configurator using the Samsung DEX mode that enable to open a desktop experience on a bigger screen such a 4K PC display, which is more efficient to work with than the size of the smartphone screen.

I have tried to use the betaflight online app first. As it seems that the online chrome app is not able to connect to FC as not serial port seems to be detected by the app, I have tried then to use the APK app for Android which is able to detect the FC here. However I encounter bugs using it in DEX mode with my Samsung S23 ULTRA on a 4K display.

The size of the font is too big, some fields are cut and the responsive resizing of some fields are not working properly.
Here are some examples of the issue of the layout of some fields where text are not well centered or cut.

To Reproduce

1. Connect S23 ultra to a 4K display (using 4K resolution)
2. open Betaflight APK app
3. connect the FC

Expected behavior

I would expect to have the same behavior than on the Chrome online app as shown here when open in DEX mode with a 4K screen. (But not usable as no serial connection is detected by Betaflight).

App version

2025.12.1

Flight controller configuration

Add any other context about the problem that you think might be relevant here

2 questions for the issue :

• Is there any reason that the Online App is not able to detect FC connected to the Screen Hub connected to my Smartphone using DEX mode ? Would be very usefule to be able to use the app on chrome on smartphone especially when you work with a desktop experience such samsung DEX mode.
• Using the APK for Android, is there a way to enhance the web responsive behavior to resize the app correctly depending on the sceen size used ?

[YarosMallorca]

Is there any reason that the Online App is not able to detect FC connected to the Screen Hub connected to my Smartphone using DEX mode?

Yes, mobile browsers do not support WebSerial, which is the API that the configurator uses to connect to the FC; recently Chrome on Android added support, but only over Bluetooth, not USB.

The Android app (APK) "bypasses" this restriction by using a bridge to native Android APIs/SDK.

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Using the APK for Android, is there a way to enhance the web responsive behavior to resize the app correctly depending on the sceen size used?

It probably wasn't tested in this scenario, as it is quite unusual. I don't have the necessary hardware to reproduce this issue, I'll maybe try to reproduce this on an Android emulator.

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