ConditionalRenderingTemplate.razor

@inherits LayoutComponentBase

<AuthorizeView>
    <Authorized>
        <div class="sidebar">
            <!-- render auth sensitive views if user authenticated -->
        </div>
    </Authorized>
	<NotAuthorized>
		<div>
            "Sorry!"
        </div>
    </NotAuthorized>
</AuthorizeView>

@code{
    [CascadingParameter]
    private Task<AuthenticationState> authenticationStateTask { get; set; }
	//...other code
}