I am new to Looker Studio and have made a new dashboard. I must’ve pressed something, as the side bar where the controls for editing charts (e.g. the data/chart properties) has completely disappeared.
Even when I go to do something like Page > Manage Pages, no bar appears so I can’t take any action.
You are not seeing the side menu or the other options in the top menu because you must have removed all data sources. Add any data source, and the options will return.