Change size of the boards

Add this code to the Custom CSS field on the Style tab of your Pinterest Feed widget’s settings:

.global-styles,
:root {
  --board-width: 20%;
  --board-height: 150px;
}

.eapps-pinterest-feed-large .eapps-pinterest-feed-data-item-boards-item, 
.eapps-pinterest-feed-extra-large .eapps-pinterest-feed-data-item-boards-item {
  max-width: calc(var(--board-width) - 12px);
}

.eapps-pinterest-feed-data-item-boards-item-image-container {
  height: var(--board-height) !important;
}