yes
Styles & Templates -> Styles Manager -> Select your Style -> Block Templates ->
edit you block_html (or whatever block it is)
find this
Code:
<div class="blocksubhead">
and comment out the following below
Code:
<a class="collapse" id="collapse_block_html_{vb:raw blockinfo.blockid}" href="{vb:raw relpath}#top"><img alt="" src="{vb:stylevar imgdir_button}/collapse_40b.png" id="collapseimg_html_{vb:raw blockinfo.blockid}"/></a>