It's pretty annoying behaviour. I suppose it's coming from the datasource and not Grafana - correct me please if I'm wrong.
Expectation would be to not reload anything automatically. There are often situtation where you have a log entry open and checking some fields and their values and only then want to construct the whole query.
If it keeps running in the meantime the "preview" of particular log is gone.
EDIT:
Plugin version: v0.4.0 / v0.3.2
quickwit: 0.7.1