You can prioritize services in the drop-down menu to make them appear at the top of the menu. Just specify the service code name of one or more services.

var a2a_config = a2a_config || {};
a2a_config.prioritize = [ 'mastodon', 'x', 'reddit', ];

In Drupal, add the following JavaScript code to your "Additional JavaScript" box in Configuration > Web services > AddToAny > Additional Options.

In WordPress, add the following JavaScript code to your "Additional JavaScript" box in Settings > AddToAny.

a2a_config.prioritize = [ 'mastodon', 'x', 'reddit', ];