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When you build the wysiwyg editor object you can use the parameter 'small' to make a toolbar with few buttons.
Example:
XoopsFormWysiwygTextArea( _MD_CONTENTC, 'content2', $content, '100%', '400px','small');
If you want you can build your own buttons array
Example:
$myToolbar= array('bold','forecolor','hilitecolor');
And when you call the wysiwyg editor:
XoopsFormWysiwygTextArea( _MD_CONTENTC, 'content2', $content, '100%', '400px',$myToolbar);
On docs you have a complete list with all buttons.