PlayerSettings.Android.maxAspectRatio

Description

Maximum aspect ratio which is supported by the application.

This value is expressed as (longer dimension / shorter dimension) in decimal form. It can't be set to a value lower than 1.86 which matches the aspect ratio of 16:9. By default, it is set to 2.4 which means the application supports all devices with aspect ratio up to 21.6:9. For more information, refer to Support different screen sizes.

using UnityEditor;
using UnityEditor.Build;
using UnityEngine;

public class MaxAspectRatio : MonoBehaviour
{
    [MenuItem("Build/Android Max Aspect Ratio Example")]
    public static void AndroidArchitectures()
    {
        PlayerSettings.SetScriptingBackend(NamedBuildTarget.Android, ScriptingImplementation.IL2CPP);
        PlayerSettings.Android.targetArchitectures = AndroidArchitecture.ARM64;

        //Set the maxAspectRatio to the default value
        PlayerSettings.Android.maxAspectRatio = 2.4f;

        BuildPlayerOptions options = new BuildPlayerOptions();
        options.scenes = new[] { "Assets/Scenes/SampleScene.unity" };
        options.locationPathName = "Builds/AndroidBuild.apk";
        options.target = BuildTarget.Android;
        options.targetGroup = BuildTargetGroup.Android;

        BuildPipeline.BuildPlayer(options);
    }
}