A picture for context
A few observations
When doi field is defined in the .bib file, the bibliography style appends it very nicely at the end of the reference, as it can be seen in [3]. In addition, we can see that the title of the reference is also a link, but that is only because there is additional url field defined. This field is also printed at the end of the reference, as also shown in [3].
In [4], the url is omitted. Instead the eprint field is given, containing the arxiveId, which nicely puts a link at the end. In the same way it happens to the doi field, here the arxivId also does not turns the title into a link.
I don't like the way things are. Assuming its ok to do minor changes to the provided Elsevier template, how to print the title as a link when either doi, arxiv or URL are provided?

doiandeprintfields, and provideurlfields on all entries. – rmolina Aug 07 '21 at 02:36