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For the existing setup, Go to company setup > General Tab > Email Dashboard notification setting > and reset the same with the delete button and then set back the required toggle to show the data on the dashboard.
Yes, It is possible to show the "Hold GRN" option on the Vendor invoice page.
Go to setup > Invoice Tab > Hold GRN Visible In Vendor Invoice Page? has to be enabled. Once enabled then the Hold GRN option will come.