This article explains how to check traffic logs for specific policy using a new feature introduced in v5.4.Solution
With version 5.4, instead of manually creating a filter in Forward Traffic logs to get logs only for some specific policy, this new option can be used to display them directly from a firewall policy.
Go to Policy & Objects – IPv4 Policy and select policy for which the matching logs are required. Use a right click to display other options and select “Show Matching Logs”. This will automatically open Forward Traffic logs for the selected policy.