Set fullscreen resolution in FS-UAE

[MCF]

As the title suggests... how do I change the fullscreen resolution in FS-UAE?

I am using FS-UAE Launcher in conjunction with Launchbox to manage my Amiga and Amiga CD32 games... but it is stuck at 1920x1080 fullscreen instead of capturing my desktop resolution of 3840x2160.

I have reviewed both https://fs-uae.net/video-options and https://fs-uae.net/configuration-files

These are my current Video and Advanced Video in FS-UAE Launcher.

 

Below is one of the sample fs-uae config files I created in my Configuration folder.

[fs-uae]
amiga_model = A1200
fast_memory = 8192
hard_drive_0 = D:\Games\Amiga/Chaos Engine 2.zip
x_whdload_args = ChaosEngine2AGA.Slave PRELOAD

Appending the following 2 lines did not do anything, and it still loads in 1920 x 1080.

fullscreen_width = 3840
fullscreen_height = 2160

Any help is greatly appreciated. Thank you.

[MCF]

Problem mysteriously went away without my doing anything...

Amiga games are now launching in 3840x2160 fullscreen.