In Hostinger's Pro Panel you can perform bulk updates to the core version, plugins, and themes of WordPress websites.

To do so, go to the Websites section in Pro Panel, select all the WordPress websites that you want to modify, and click on Bulk actions:

Then, select the preferred action(s):

Click on Proceed, and then click on Update to confirm the changes.

Finally, you'll get a pop-up informing you that the update is in progress. It may take up to 15 minutes. You can safely close the pop-up – the update will be completed automatically, behind the scenes.

And that's how you make bulk actions with WordPress websites in Pro Panel!