discourse_theme_ran/desktop/desktop.scss

.bulk-select-enabled {
  .topic-list-header .topic-list-data.default {
    position: sticky;
    top: 10em;
  }
  .topic-author-avatar-data {
    display: none;
  }

  .bulk-select.topic-list-data {
    grid-area: avatar;
    margin-left: -0.5em;
    padding: 0;
    margin-top: 2.5em;

    @media screen and (max-width: 576px) {
      margin-top: 0;
      label {
        padding-block: 0.345em;
      }
    }

    input {
      transform: scale(1.5);
    }
  }
}

.topic-list-header {
  tr {
    border: none;
  }

  .topic-list-data {
    padding: 0;

    &:not(.default) {
      display: none;
    }

    &.default {
      position: absolute;
      right: 0;
      .bulk-select,
      span:not(.bulk-select-topics, .d-button-label) {
        display: none;
      }
    }
  }

  .bulk-select-topics {
    position: absolute;
    right: -1em;
    @media screen and (max-width: 1048px) {
      right: 0;
    }

    background: var(--secondary);
    border-radius: 0 0 0 var(--d-border-radius);
    padding: 1em;
    button {
      white-space: nowrap;
    }
  }
}