'The menu collapses completely when you select any item in the Templates Sakai PrimeNG submenu

I'm studying Sakai Templates from Priming. The source code of this Templates is here sakai-ng There is a submenu in the side menu. In which I added the transition to the page

items: [
    {label: 'Submenu 1', icon: 'pi pi-fw pi-bookmark',
        items: [
            {
                label: 'Submenu 1.1', icon: 'pi pi-fw pi-bookmark', routerLink: ['/pages/timeline']
            },
            {
                label: 'Submenu 1.2', icon: 'pi pi-fw pi-bookmark',routerLink: ['pages/crud']
            },
        ]
    },

And when you select any of the submenu items Submenu 1.1 or Submenu 1.2 - the entire Submenu 1 menu collapses completely.

Which is very inconvenient. Is there any option in this menu to prevent it from collapsing?

primeng

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'The menu collapses completely when you select any item in the Templates Sakai PrimeNG submenu

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