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[.m.]

admin panel >> templates >> your forum's active theme templates >> Forum Display Templates >> forumdisplay_thread
find code like below

<span>{$prefix} {$gotounread}{$thread['threadprefix']}<a href="{$thread['threadlink']}" class="{$inline_edit_class} {$new_class}" id="tid_{$inline_edit_tid}">{$thread['subject']}</a>{$thread['multipage']}</span>

change like below and save the template

<span>{$prefix}{$thread['threadprefix']}<a href="{$thread['threadlink']}" class="{$inline_edit_class} {$new_class}" id="tid_{$inline_edit_tid}">{$thread['subject']}</a>{$gotounread}{$thread['multipage']}</span>