So I have no TOGGLE LANGUAGE BLOCK, NOT APPEARING IN WEBSITE SETTINGS SIDEBAR MANAGEMENT BUT IT IS ENABLE AND INSTALLED IN THE PLUGIN SECTION
Please check do you have more than one language enabled for that journal.
If you have an upgraded installation (from 2.x), then it cloud be this issue: OJS 3.0 - Choose language & Search at the index page - #23 by ajnyga
See Alec Smechers post below the linked post with a solution.