I have lost the changes I had in the project, is there a way to recover them?
If you haven't saved the changes correctly you won't be able to recover them.
There are two ways to save changes to a project:
By clicking the Save button (bottom right in each section of the project).
Switching between sections of the project (from Editor to Results, for example).
WARNING
Note that if you have the project open in multiple tabs or from different computers you may also lose or overwrite changes.