It is not possible without a small change to the code. I think I could justify making this an optional argument actually and then it would just need a small change to the theme template. I will see what I can do. Meanwhile I could give you a small edit to make to core code which would achieve this.

Please share the code with me….thanks 

You would need to edit the file /simple-press/forum/content/sp-common-view-functions.php

The function you need to edit is called sp_QuickLinksForum() and can be found starting around line 1283 of the file.

Locate this line of code within the middle of the function:

if (!empty($forum->subforums)) $out.= sp_compile_forums($forum->subforums, $forum->forum_id, 1, true);

and comment it out.

I have added code to the next update that will enable this as an option to be turned on in the theme template which is how it should be handled.