Indeed, as far as I can see this journal has no template, just follow strictly the guidelines as described here: https://www.elsevier.com/journals/journal-of-king-saud-university-science/1018-3647/guide-for-authors Some publishers provide and require the use of their template as far as I know Elsevier is not having this policy.
For (additional) examples you can check some papers already published. Normally they 'just' want plain text following their set-up/style, the actual editing will be performed once your manuscript is accepted.
Good luck with your submission.
Best regards.
PS. See also some good answers here about Elsevier journals in general: https://www.researchgate.net/post/Where_can_I_get_MS_Word_Template_for_Renewable_Sustainable_Energy_Reviews_Elsevier_Journal