This is especially useful if you use postbit_legacy because the signatures can sometimes be a bit obtrusive, but can be used with postbit as well. It will simply reduce the default font size of the signature text, which will help.
Open postbit or postbit_legacy
Search for 'signature' in the template and you will find this:
Change the bit in red to:
Done. The display of signatures in the users profile isn't effected.
You may also want to make the same change in newpost_preview as well.
Open postbit or postbit_legacy
Search for 'signature' in the template and you will find this:
Code:
<!-- sig --> [COLOR="Red"]<div>[/COLOR] _____________________<br /> $post[signature] </div> <!-- / sig -->
Code:
<div class="smallfont">
You may also want to make the same change in newpost_preview as well.