Tools \ Options \ General \ Repo settings \ [x] Re-open repository tabs at startup
Even if this option is checked, it doesn't work. The new tabs we just created disappear when we reopen Sourcetree.
I have searched this folder without success for any configuration files
C:\Users<your user>\AppData\Local\SourceTree
I solved the problem by making this hidden folder Sourcetree visible from the file explorer
C:\Users\<your user>\AppData\Local\Atlassian\SourceTree