Set the time range to "Last 6 hour" or some time range or filter that will take a long time to query.  (I also have it display 500 rows.)  After ten seconds, it times out with the following:

Unable to get flows

Error: Request failed with status code 503 Message: Loki query failed: Get "http://loki:3100/loki/api/v1/query_range?query={app=%22netobserv-flowcollector%22,FlowDirection=%220%22}|json|SrcK8S_Namespace=_{%22.mywebapp.%22|DstK8S_Namespace=}%22.mywebapp.%22&start=1649084225&limit=500": context deadline exceeded (Client.Timeout exceeded while awaiting headers)