How to fix backfill issue on dashboard while using live streaming?

Hi Team,
I am using telegraf to write data to influx and using Grafana as a data source and query type is live measurment. in this I am facing backfill issue.
how can I fix this so that I can get past data as well with live streaming?
I am trying this with Mixed data source but not sure does it support realtime(live measurment) with influxdb or any other data source??

Dashboard having backfill issue showing in following image