mapo-core/MP.SPEC/Shared/MainLayout.razor.cs

namespace MP.SPEC.Shared
{
    public partial class MainLayout
    {
        protected bool navLarge { get; set; } = true;

        protected string sideClass { get; set; } = "sidebar";

        protected void UpdateNavDisplay()
        {
            navLarge = !navLarge;
            sideClass = navLarge ? "sidebar" : "sidebarSmall";
        }
    }
}