It was solved with just adding the existing menuStrip to other forms via
form1.Controls.Add(menuStrip);
form2.Controls.Add(menuStrip);
solved Visual Studio set one menu strip for multiple forms
It was solved with just adding the existing menuStrip to other forms via
form1.Controls.Add(menuStrip);
form2.Controls.Add(menuStrip);
solved Visual Studio set one menu strip for multiple forms