Add more slide

Yes you can add more slides in settings/presentation page/custom slides.

Hope that helps. Keep me posted!

I know this page but just 5 item are available.
I changed defaults.php and settings.php in the admin folder and frontpage.php in the root, but I don’t like this solution because all changes will be deleted with the next update

If you are using a child theme, your changes would not be deleted. Create a copy of those files and make your change to the child version.

Yes, but, except frontpage.php, the others files are in the admin folder and if I paste these files in child theme is impossible for me connects them with their area.

C16. What if I want more than 5 slides on the presentation page?

You can define up to 5 custom slides, but you can also set the slider to grab the slides from: latests X posts, X random posts, latest X sticky posts, latest X posts from category, random X posts from category, specific posts (by ID) – X is a configurable count.

To make slider compatible posts it is required to add a post title (which will be used as the slide title) and a post featured image (which will be used as the slide image). Make sure the featured images are of proper size (the same one as the slider is configured).