Three ways to interact
View is for reading the map, Work is for changing it, and Present clears the screen for an audience. You can move between them at any time.
What Work mode changes, and what it never does
You can change definitions, stars and connections. Your verbatim quotes are never altered; tidied wording goes in the refined_quote column of your spreadsheet.
Keeping your changes
Since nothing is kept in the browser, changes made in Work mode last until you close the tab unless you save your progress. Saving downloads them as files you keep.