Hi,
If you set two decimal place under General settings--->Display tab, then cost will be showed in two decimal places.
Please make note that,
1. If no journal entry has been posted, you can increase or decrease the number of decimal places.
2. After a journal entry has been posted, you can only increase the number of decimal places, up to 6 digits. This change is irreversible. Decreasing the number of decimal places after a journal entry has
been posted is impossible.
Check in Test DB for better understanding.
Thanks & Regards,
Nagarajan