<!-- Welcome! Before creating a new issue: * This is an extension for JupyterLab repository. Unrelated issues will be closed. * Search for relevant issues * Check that you have updated both the jupyterlab extension and the python package to the same version --> ## Description <!--Describe the bug clearly and concisely. Include screenshots if possible--> On the [storybook](https://jupyterlab-contrib.github.io/jupyter-ui-toolkit/?path=/docs/components-search--documentation), I still see a similar issue but only due to the close button:   ## Expected behavior <!--Describe what you expected to happen--> Placeholder is visible in the full width when the close button is hidden