Hi T3-User,

It is simple that you can use module class suffix to the sidebar menu module.
like sidebar-menu

Then you can add css to your custom.css

.sidebar-menu .dropdown-menu { display: block !important; }

Hope it helps,

Regards

Thank you very much,

it worked, but i didn´t get the expected result. The submenu stay open and overlays with following menus. Meanwhile i found another solution. But your answer helped me to understand joomla and css much better.

The submenus are treated as 1st level Menus and i added a CSS-style for links for every submenu entry, like "submenu1" "submenu2"

Then i addes the following to the custom.css

.submenu1 { text-indent:10px; }
.submenu2 { text-indent:20px; }
.submenu3 { text-indent:30px; }

Regards