Hide image alt text on a portfolio index page

Hi
I would like to hide the (probably) image alt text below the logos on a portfolio index page. Any code fot that?

Can you share your website URL and this page?

Hi Ziggy. Sorry for my delay: 
https://www.salondelaphoto.ch/exposants

Are you offering paid support?

11 minutes ago, Imager said:

Are you offering paid support?

I can do if that's something you want.

Use this in Custom CSS to remove the portfolio captions:

section[data-section-id="64f988b54c724255853476da"] {
  .portfolio-grid-basic .grid-item .portfolio-text {
    display:none;
  }
}