How to make a linebreak in icon box text?

you mean that iconbox heading – or in the content text?

the quick and easy way: inserting a “soft-hyphen” manually that sign is ­ or : ­

so when filling out the title – insert this sign where the word can break! –
But you can not see it in your entered preview – but it is active.
And if you open that ALB again – the setting is lost.

the other method is to let the hyphens set automatically. But something like this:

.iconbox .iconbox_content .iconbox_content_title {
    word-wrap: break-word;
    hyphens: auto;
}

will often end up in word-break without dash ! this looks ugly.

my recomendation: do it manually with additon of a small enfold plugin.

Guenter here from the board has written a little plugin to insert into input fields of enfold special characters like bigger than or less than sings – quotation marks etc. – you can find that on : https://github.com/KriesiMedia/enfold-library/tree/master/integration%20plugins/Enfold/Special%20Character%20Translation

this could be installed like a normal plugin. Afterwards you can have tag signs or quotes etc. f.e. in tables or in heading input fields.
add that Line to the plugin:
'#shy#' => '­', so you can use #shy# for ­. or the same thing: ­

because i’m a lazy guy i only edited that plugin a bit – so that the list does not have three # before and after that translation part.
so my part of that looks like this:

sorry Boardsoft transfers directly the special characters to something else – even if it is in code tags:
so here is the image of it:

so you can use it like this:

and you can edit it again and again – you can see it in the preview where you have inserted it – but on Frontend:
https://webers-testseite.de/iconboxes-with-equalheight/