For the following tweaks locate the folder with the config files:

C:\Users\profile_name\AppData\Local\FarlightExplorers\Saved\Config\WindowsNoEditor

Where "profile_name" above is your windows account name.

A quick way to get here is open up a file explorer window then in the address bar type "%appdata%" (without quotes). You will end up in "C:\Users\profile_name\AppData\Roaming", go up/back one folder then continue navigating to the initial full directory given above.

Note:
Always make a backup of the files in question before editing them so you can revert changes back to their initial settings prior to your "tweaks".

Open up "GameUserSettings.ini" in your favorite editor or just use notepad.

The below changes are made under the header "[/script/engine.gameusersettings]":

Resolution:

Look for "ResolutionSizeX" and change to your desired horizontal resolution.
Look for "ResolutionSizeY" and change to your desired vertical resolution.

Eg (for my 21:9 monitor I use):

This way you can play using resolutions not currently available via the in-game settings.

Vsync:
Can be changed via the in-game menu, alternatively you can also set it here.

Eg (to turn vsync on):

Screen Mode:

Another useful setting is the "FullscreenMode".

Here are the possible options:

0 = Fullscreen
1 = Windowed Fullscreen aka Borderless Fullscreen
2 = Windowed

Eg (for borderless fullscreen I use):

Audio Quality:

I know its not a display option but, because we are already here, and because it might improve your audio, lets include this one.
I saw that "AudioQualityLevel" was set to 0 by default, I know that the highest for the Unreal game engine is 3. Although I could not tell a difference t.b.h. my game still runs fine so no harm done, if it negatively impacts your game set it back to 0.

Eg:

Lens Flare:

Want to get rid of that annoying lens flare from the flashlight and each and every time you place an object?

Open up "Engine.ini" in your favorite editor or just use notepad.

Add the following header and text underneath the already existing "Paths" entries.
Just for completion I will include below the entire Engine.ini contents.

That's it for now, I hope it helps some people adapt the game to their native monitor resolution and maybe tweak it a little more to their liking.

If you have any more undocumented tips or tricks along these lines then let me know and I can add them while providing you with credit of course.