Helix3

Czesc Zbigniew,

it's becuase after Bootstrap update classes were changed, but you probably have template based on Helix, not raw Helix and that's why.

Hopefully easy to correct with custom CSS. Moment...

I don't know what template name you have there, so let's try that method

in Column settings > Custom CSS Class > put those names (add 1 space before name!)

d-none d-sm-none d-md-none

It's solution when your site is using bootstrap 5.x

If somehow it will not help, add also that Custom CSS:

@media screen and (max-width: 860px) {
.d-sm-none, .d-md-none, .d-none {
  display: none !important;}
    }

instead of 860px you can also use 1024px (iPad classic).

Look up :)