app/node_modules/ng-zorro-antd/image/style/patch.less

@image-prefix-cls: ~'@{ant-prefix}-image';

.cdk-overlay-backdrop {
  &.ant-image-preview-mask {
    opacity: 1;
  }
}

.cdk-global-overlay-wrapper[dir='rtl'] {
  .@{image-prefix-cls} {
    &-preview {
      &-switch-left {
        right: 10px;
        left: unset;

        rotate: 180deg;
      }

      &-switch-right {
        right: unset;
        left: 10px;

        rotate: 180deg;
      }
    }
  }
}