<li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="collapse" aria-haspopup="true" aria-expanded="false"> Manage </a> <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink"> <a class="dropdown-item" asp-controller="Administration" asp-action="ListUsers"> Users</a> <a class="dropdown-item" asp-controller="Administration" asp-action="ListRoles"> Roles</a> </div> </li>
I tried on Opera, Chrome, Brave, Explorer...
Firstly, please be sure you use Bootstrap version 4.x.
Then change
data-toggle="collapse"
todata-toggle="dropdown"
like below:Result: