The editor was moved to the right side in JupyterLab 3: JupyterLab Changelog — JupyterLab 3.0.1 documentation
You can right-click on the icon and move it to the left side if you prefer it there.
The editor was moved to the right side in JupyterLab 3: JupyterLab Changelog — JupyterLab 3.0.1 documentation
You can right-click on the icon and move it to the left side if you prefer it there.