When using the Toggle Post Filter option in the Tag Groups plugin, you can customize items with CSS.
For example: If you want to change the width of the first two posts, you can use the following CSS:
@media screen and (min-width: 1200px) {
#tg_filter_dpf_toggle_box_posts article:nth-child(1),
#tg_filter_dpf_toggle_box_posts article:nth-child(2) {
width: 49% !important;
}
}The width of 49% means that you show two items in a row. You can experiment with that number so that these posts are as wide as possible and still fit together into a row, including their margins.
The min-width: 1200px part makes sure that this styling only affects large screens. On mobile devices each row should have only one post. Here too you can try different numbers.