GameWindow.IsValid

Returns

bool True if this window is valid and not destroyed.

Description

Returns true if this window is valid and not destroyed.

using UnityEngine;
using UnityEngine.Windowing;

public class IsWindowValidExample : MonoBehaviour
{
    void Start()
    {
        var window = GameWindow.Main;
        bool valid = window.IsValid();
        Debug.Log($"Is window valid: {valid}");
    }
}