Yes this is possible with a very simple solution. Add this code snippet to your theme’s funtion.php
add_action('admin_menu','remove_default_post_type');
function remove_default_post_type() {
remove_menu_page('edit.php');
}
More info: https://www.techjunkie.com/remove-default-post-type-from-admin-menu-wordpress/ or https://codex.wordpress.org/Function_Reference/remove_menu_page