SecondScreen won't let me save the profile

[idkw]

Hello,

I have a Google Pixel 8 Pro
I connected the phone to a PC and ran the adb command on the PC

First command to show that the PC recognized the device through adb

>adb devices
List of devices attached
3C111FDJG000P2  device

Second command to apply the permission:

adb shell pm grant com.farmerbb.secondscreen.free android.permission.WRITE_SECURE_SETTINGS

It accepted the command without showing any error so I assumed it worked

Then I tried to create a 1920x1080 profile in SecondScreen on the phone but it doesn't let me save the profile.
The is a toaster message that shows up for a second that says "For your security SecondSecond won't let you ...." and the message is truncated so I have no idea what the message is about.

Does anyone know what's wrong ?

Thanks

[bigheadming]

I have the same problem with Google Pixel 9 Pro.

[idkw]

I found the solution, in the settings you need to enable the option "Enable expert mode"

The app was probably thinking those resolutions were unsafe but it actually works