[PromQL] What is the essence of interval in conjunction with counter?

Question

Monitoring

Stack:

• Prometheus
  
• Grafana
  

As far as I understand from the documentation, if you make a query like
sum(increase(counter_metric{}[5m]))
Where counter_metricis some Counter metric, then this query will take only records for 5 minutes.
But at the same time, a time filter from grafana is also used.
From the graphs, I see that there is clearly not the last 5 minutes.
Then how does it actually work?