Purpose

There is currently no configuration to hide the All updates or Popular button from the Discover sidebar. The guide below will assist you in a few variety in hiding the All updates or Popular button from the dashboard.

Confluence Admin with large instances may want to hide this function as there are many users who are constantly updating in Confluence. However, there is currently an enhancement request to bring this functionality to Confluence:

• CONF-43399 - Getting issue details... STATUS

Workaround

Original View of Discover section

To imitate the outcome below, please insert the chosen code below to  Administrator  > General Configuration > Look And Feel > Custom HTML in the "At end of the HEAD" session

<script type="text/javascript">
AJS.toInit(function(){
  {
    AJS.$("#sidebar-discover").hide()
  }
});
</script>

<script type="text/javascript">
	AJS.toInit(function() {
		setTimeout(function() {
			if (AJS.$("#sidebar-discover .nav-item-all-updates").length > 0) {
				AJS.$("#sidebar-discover .nav-item-container-all-updates").hide();
				AJS.$("#sidebar-discover .nav-item-container-popular-stream").hide();
				return;
			}
		}, 100);
	});
</script> 

<script type="text/javascript">
	AJS.toInit(function() {
		setTimeout(function() {
			if (AJS.$("#sidebar-discover .nav-item-all-updates").length > 0) {
				AJS.$("#sidebar-discover .nav-item-container-all-updates").hide();
				return;
			}
		}, 100);
	});
</script>

<script type="text/javascript">
	AJS.toInit(function() {
		setTimeout(function() {
			if (AJS.$("#sidebar-discover .nav-item-all-updates").length > 0) {
				AJS.$("#sidebar-discover .nav-item-container-popular-stream").hide();
				return;
			}
		}, 100);
	});
</script>

For more modification on How to hide elements in Confluence using CSS or JavaScript, it can be found at the link: How to hide elements in Confluence using CSS or JavaScript

You can change your Site's default landing page from Dashboard (All Updates) to any space by following the steps in the following link: Configuring the Site Home Page