Changing the default currency will not achieve the goal of rounding all currency values to four decimal places and displaying the correct currency symbol for each currency. Adjustments to rounding and currency symbols typically need to be set on a per-currency basis and not just by changing the default currency.


To shorten the quote numbers to the minimum possible length, you should reduce the auto number prefix to one character. This change directly affects the specific entity of quote numbers without having broader implications on other entities, thus achieving the desired outcome without unnecessary modifications.


The default currency in personal options is the correct setting to change. Each user can define their own default currency in their personal settings, which will influence how currencies are displayed for that user. Since only the sales manager is experiencing this issue, correcting their personal settings to reflect the appropriate default currency should resolve the problem with the displayed currency symbol.