just found it out how to get default linear view ...
in /includes/thread.inc.php find ..
if($thread_display==0) $smarty->assign('subtemplate','thread.tpl.inc');
else $smarty->assign('subtemplate','thread_linear.tpl.inc');
replace with ..
if($thread_display==0) $smarty->assign('subtemplate','thread.tpl.inc');
else $smarty->assign('subtemplate','thread_linear.tpl.inc');
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in /templates/templatename/subtemplates/subnavigation_2 find ..
{if $usersettings.thread_display==0}<span class="small"><a href="index.php?mode=thread&id={$id}&toggle_thread_display=true" title="{#thread_linear_linktitle#}"><img src="templates/{$settings.template}/images/thread_linear.png" alt="" width="12" height="8" />{#thread_linear#}</a></span>{else}<span class="small"><a href="index.php?mode=thread&id={$id}&toggle_thread_display=true" title="{#thread_hierarchical_linktitle#}"><img src="templates/{$settings.template}/images/thread_hierarchical.png" alt="" width="12" height="8" />{#thread_hierarchical#}</a></span>{/if}
replace with ..
{if $usersettings.thread_display==0}<span class="small"><a href="index.php?mode=thread&id={$id}&toggle_thread_display=true" title="{#thread_hierarchical_linktitle#}"><img src="templates/{$settings.template}/images/thread_hierarchical.png" alt="" width="12" height="8" />{#thread_hierarchical#}</a></span>{else}<span class="small"><a href="index.php?mode=thread&id={$id}&toggle_thread_display=true" title="{#thread_linear_linktitle#}"><img src="templates/{$settings.template}/images/thread_linear.png" alt="" width="12" height="8" />{#thread_linear#}</a></span>{/if}