Hi there,
There is a dirty way to have 20 items shown instead of 100 in CSS. You can add the code below to X > Launch > Options > CSS:
.x-sidebar .widget a.x-recent-post100 {
display: none;
}
.x-sidebar .widget a.x-recent-post100:nth-child(1),
.x-sidebar .widget a.x-recent-post100:nth-child(2),
.x-sidebar .widget a.x-recent-post100:nth-child(3),
.x-sidebar .widget a.x-recent-post100:nth-child(4),
.x-sidebar .widget a.x-recent-post100:nth-child(5),
.x-sidebar .widget a.x-recent-post100:nth-child(6),
.x-sidebar .widget a.x-recent-post100:nth-child(7),
.x-sidebar .widget a.x-recent-post100:nth-child(8),
.x-sidebar .widget a.x-recent-post100:nth-child(9),
.x-sidebar .widget a.x-recent-post100:nth-child(10),
.x-sidebar .widget a.x-recent-post100:nth-child(11),
.x-sidebar .widget a.x-recent-post100:nth-child(12),
.x-sidebar .widget a.x-recent-post100:nth-child(13),
.x-sidebar .widget a.x-recent-post100:nth-child(14),
.x-sidebar .widget a.x-recent-post100:nth-child(15),
.x-sidebar .widget a.x-recent-post100:nth-child(16),
.x-sidebar .widget a.x-recent-post100:nth-child(17),
.x-sidebar .widget a.x-recent-post100:nth-child(18),
.x-sidebar .widget a.x-recent-post100:nth-child(19),
.x-sidebar .widget a.x-recent-post100:nth-child(20){
display: block;
}
Hope it helps.