I have a bunch of custom functions for a Google Sheets spreadsheet (access via Tools -> Script Editor...) that were working fine. At some point I decided to back up my functions by saving a copy of the script. Now when I click Tools -> Script Editor... I get:
Select a project to open
Copy of myspreadsheet
myspreadsheet
Create a new project
The spreadsheet now alternates between the two scripts in an unpredictable fashion, using an old version of the same functions, then switching. How can I designate which one it should use? I can't even work out how to delete one of them.