Change space between items in the left sidebar of Confluence

General Configuration > Look and Feel > Stylesheet > Press Edit in Global Stylesheet and pasted it:

	.ia-fixed-sidebar div.plugin_pagetree ul.plugin_pagetree_children_list>li>div.plugin_pagetree_childtoggle_container {
	height: 20px; /*normally 30*/
	}
	.ia-fixed-sidebar .plugin_pagetree_children_span {
	height: 10px; /*normally 20*/
	line-height: 10px; /*normally 20*/
	}

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