Removal of Tab "What Happening" & "My Board"
To remove the first two tab i.e “WHAT HAPPENING” & “MY BOARD” in the site.
Go to the Home Page open that page after opening that page on your right side you see a box with title “Page Attribute”.
In that there are two option “Parent” and “Template”.
By default the Template option is set to “Home Template”, set it to “Default Template”.
After that simply update your page and see your site those two Tab is removed from your site.