@Peggy, look in /skin/reboot/customer/
featured_items.tpl
You need to tweak the columns around line 20
Code:
{if $descr eq "Y"}
{assign var="cols" value="col-12 col-sm-6 col-md-6 col-lg-6 col-xl-{if $config.Reboot.reboot_main_container eq 'fluid'}{if $has_sidebar}6{else}6{/if}{else}{if $has_sidebar}6{else}6{/if}{/if}"}
Bootstrap grid uses 12 columns per row, so
col-x-12 = 1 column
col-x-6 = 2 columns
col-x-4 = 3 columns
col-x-3 = 4 columns