.block-editor-block-patterns-explorer
  .block-editor-block-patterns-list
  .block-editor-block-preview__container {
  max-height: 300px !important;
}

.block-editor-block-patterns-list__item .block-editor-block-preview__container {
  align-items: flex-start !important;
}

.block-editor-block-patterns-list__list-item {
  overflow: hidden;
}