Provide an option to keep the top bar suppressed which shows the Zoho logo, Upgrade | Control Panel | ...

I like to regain window space by keeping this bar suppressed in mail, as done by clicking the Zoho logo. But that has to be done every time I start Zoho mail. An option to keep it suppressed would be nice. Of course restoring the bar with the down arrow next to Apps should be retained.

Thanks.