Manual control of menuItems in dashboardBody

I have a dashboardSidebar with multiple menuItems. Some of these menuItems have also menuSubItems. I want the user to expand and close these menuItems independently and without affecting the visulization of other menus. Now what happens is that when user expands one menuItem the other menuItems will be closed automatically. I want this process to be controled only by clicking on the arrow.
For example suppose that Menu1 is expanded and Menu2 is not (Fig. 1). Fig.2 will be resulted if I click on the Menu2:

case1 case2

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