whmcs title code how i can modified?

my whmcs title code show beleow. i want to modified it.

<title>{if $kbarticle.title}{$kbarticle.title} - {/if}{$pagetitle} - {$companyname}</title>

i want when i go my site homepage/index page then show this code like that

<title>{$companyname} - {$pagetitle}</title>

but when i go other page like shared hosting,reseller hosting etc then code show that

<title>{$pagetitle} - {$companyname}</title>
how i can do it. it possible?

Yes it is possible. Please check the following offical document of WHMCS(Page titles section) :

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In your templates, find header.tpl, use the following code :

{if $filename eq "index"}
<title>{$companyname} - {$pagetitle}</title>
{else}
<title>{$pagetitle} - {$companyname}</title>
{/if}

You Should Some Modified Mr Caner G code. like this. i think it will be work.

<title>{if $filename eq "index"}{$companyname} - {$pagetitle}
{else}{$pagetitle} - {$companyname}{/if}</title>

Alternatively you could use the template var {$isIndex}.

Like so

<title>
{if $isIndex}
{$companyname} - {$pagetitle}
{else}
{$pagetitle} - {$companyname}
{/if}
</title>

When in doubt about what template vars are available to you in WHMCS you can always use the {debug} command