Activity Bar
The Activity Bar is a column of icons that appears on the left after a project is opened in CoCalc. Use the Activity Bar to navigate to key features in CoCalc. The arrangement is similar to the Activity Bar in VS Code and the Sidebar in JupyterLab.
Just to the right of the Activity Bar there is a column of triangular icons. Click any of these to open the corresponding flyout panel. A second click will cause the panel to close.
Here are the components of the Activity Bar:
If you wish, you can easily hide it: