ProjectDDD/Assets/_DDD/_Scripts/GameUi/BasePopupUi.cs

using UnityEngine;
using UnityEngine.EventSystems;

namespace DDD
{
    public abstract class BasePopupUi : BaseUi
    {
        public abstract InputActionMaps InputActionMaps { get; }
        protected abstract GameObject GetInitialSelected();
        
        protected override void Update()
        {
            base.Update();

            var currentSelectedGameObject = EventSystem.current.currentSelectedGameObject;
            if (!currentSelectedGameObject || currentSelectedGameObject.activeInHierarchy == false)
            {
                if (!GetInitialSelected()) return;
                
                EventSystem.current.SetSelectedGameObject(GetInitialSelected());
            }
        }

        public override void Open()
        {
            base.Open();
            
            EventSystem.current.SetSelectedGameObject(GetInitialSelected());
        }
    }
}