StrangeTools/PictureMover/MainForm.cs

namespace PictureMover
{
    public partial class MainForm : Form
    {
        private readonly CoverForm _form2;

        public MainForm()
        {
            InitializeComponent();
            _form2 = new CoverForm(this);
        }

        private void Form_Shown(object sender, EventArgs e)
        {
            _form2.Show(this);
            Enter += Form_Enter;
        }

        private void Form_Enter(object? sender, EventArgs e) => _form2.Focus();
    }
}