Hidden in the top right corner, under “Search Docs” is the “Settings” button where you can access the settings for the Playground. There are not many settings in the Playground.
“Disable ATA”
Turns off Type Acquisition which means that when importing code, the Playground will not try to acquire the types via the internet.
“Disable Save-On-Type”
When the editor loses focus, or compiler flags change, the Playground will replace the URL in your browser. This doesn’t change the behavior of the back button, but it does add history entries in the browser. You can turn off this behavior via this setting, and you can use the ‘Share’ (or press cmd/ctrl + s) to copy the sharable URL.
You can choose which tabs are available in the Playground sidebar via the toggle boxes under above Playground Options.