hugo-theme-hyde-hyde/layouts/partials/sidebar/menu.html

<div>
	<ul class="sidebar-nav">
		{{ $currentPage := . }}
		{{- range .Site.Menus.main -}}
			{{ if .HasChildren -}}
			<li class="{{ if $currentPage.HasMenuCurrent "main" . }}active{{ end }}">
				<a href="#">{{ .Pre }}<span>{{ .Name }}</span></a>
				<ul class="sidebar-nav">
					{{- range .Children -}}
						<li class="{{ if $currentPage.IsMenuCurrent "main" . }}active{{ end }}">
							<a href="{{ .URL }}">{{ .Name | title }}</a>
						</li>
					{{- end -}}
				</ul>
			{{- else -}}
				<li>
					<a href="{{.URL}}">{{ .Pre }} <span>{{ .Name | title }}</span></a>
				</li>
			{{- end -}}
		{{- end }}
		</li>
	</ul>
</div>