ERPNext Unable to switch back to site erpnext

I was experimenting on creating new apps with frappe. At some stage after creating the site, I had to switch the default site using bench use library . Now I want to switch back to erpnext (the default app). But it’s not working when I run: bench use erpnext or bench use erp-next or bench use erp_next . What’s the site name to the default erpnext site. Or is there some other way to achieve this?

did you created new apps or new sites ?