I have signed in as developer account but now i dont see my previous existing live companies to switch from developer account.
When you click on the main cogwheel is it not showing the switch company in there for you?
This option is for switching the companies, does not help for switching between developer account and user account.
Apologies, does this auto-log you out of QuickBooks if you sign-into the developer site on a separate tab in the same browser?
If so we'd recommend opening an incognito tab to sign into the separate site to allow you to flick between the two 👍