[pascal mourgues]

Sharing the solution I had with my chat with the very efficient people from Ecwid (thanks guys)

Thanks for waiting, here's a CSS code that hides the 'Store' link in the breadcrumbs:

.ec-size .ec-store .ec-link--muted:nth-child(1) {
display: none;
}
.ec-size .ec-store .breadcrumbs__delimiter {
display: none;}

You need to add this code to the design theme of your store.
1) Go to Ecwid admin > Design.
2) Scroll down and click the "Create Theme" button.
3) Click the blue "Add New CSS Theme" button.
4) Paste the code into the field.
5) Click "Activate" under the "Status" on the right.
6) Click "Save" in the top right corner.

And

.ec-size .ec-store .ec-link--muted {font-size: 0;}
.ec-size .ec-store .ec-link--muted:after {content: "← BACK"; font-size: 16px; }

To change the text!