The following snippet shows all menu entries of a site except the one for the current site. Replace main
in .Site.Menus
and .IsCurrentMenu "main" .
if your menu has a different name.
{{ $currentNode := . }}
{{ range .Site.Menus.main }}
{{ if not ($currentNode.IsMenuCurrent "main" .) }}
<a href="{{ .URL }}"> {{ .Name }} </a>
{{ end }}
{{ end }}