Every so often the Xero Menu Bar disappears. I can’t help you to make it magically return, but here are some shortcuts you can use to help you keep working in Xero.

Dashboard https://go.xero.com/Dashboard/
Reports https://reporting.xero.com/!vAzro/summary
Accounts Receivable https://go.xero.com/AccountsReceivable/Search.aspx
Accounts Payable https://go.xero.com/AccountsPayable/Search.aspx
Payroll https://payroll.xero.com/Dashboard/Details?CID=!vAzro
Projects https://go.xero.com/app/!vAzro/projects/
Contacts https://go.xero.com/Contacts/Search/