platform-bi-web/app/components/datasource/dataSource.less

.datasource-tabs {
    .ant-tabs-bar {
        margin-bottom: 0;
        .ant-tabs-extra-content {
            height: 100%;
            .datasource-tabs-tools {
                .ant-input-search {
                    width: 200px;
                    margin-right: 5px;
                }
            }
        }
    }
}