Bug : formatting issues

With Excel on the desktop, I prefer to use Verdana as my default font, and I try the same on Zoho Sheet. First issue is that there's no way in Zoho to specify a default font other than its default. Second, if I click on the top left cell to change font for the whole sheet, font changes take a long time to propagate. Third, I seem to be losing my font changes randomly between successive accesses of my sheet.