Hello @aram_mohammed,
The layout of the article and reference will dependent on the theme you choose. Changing this within the theme you’ve chosen will require customization, please see Abstract layout OJS 3.1.0-1 Manuscript theme - #7 by czirfusz for how this may be done.
Publishing a PDF in the galley is a matter of journal preference but is commonly done within publishing. It offers different reading formats for your readers.
Kind Regards,
Patricia M.
Public Knowledge Project Intern