This is assuming you are editing two different stores that are associated with two different email addresses and either you are the owner or staff of both accounts:
Enter “auth logout”. This will give you - sucessfully logged out of [storename]
Go to another project’s terminal and enter "shopify theme dev --store=[another store’s name]
A new tab opens for authentication. You’ll have to log into the admin panel with the email assosciated with another account.
You will see "Logged into store [storename] in partner organization [org name] upon sucessful authentication.
Goodluck!
Hi @raymart-pc , I encountered the same issue. If you are creating a new project in an empty folder, after executing @smush1 's commands, please run the shopify theme pull command followed by the shopify theme dev command.