You can use the enumitem package/module, see here: http://wiki.lyx.org/Tips/Enumitem If for example you don't want extra space between bullets you can use the option nolistsep. You can also set specific list separation.
- How do I decrease the space between bullets (1.6.2, all... Sophie (itsme213)
- Re: How do I decrease the space between bullets (1... Anders Host-Madsen