Migration of InfluxQL to flux query


I have a question about migration from Influxdb 1.8 (InfluxQL) to Influxdb 2.0 (Flux). On Grafana blog I found that “For those who are familiar with InfluxQL, the original query language for InfluxDB, those queries are still supported and can run side-by-side with new Flux queries.”. Unfortunately, after changing from InfluxQL to Flux in my datasource, all InfluxQL queries are gone. How can I run InfluxQL and Flux on the same dashboard?