Fix time range for time series data panel

My data source is postgres and I want to fix a time range for a specific panel, so as when the time range button is changed my graph does not change.

As one can see in this picture, I have a query but whenever I select a different range on the top bar that will change my chart. I would like to have it fixed from now - 2M actually.

Can you please share your query with us. Copy and oaste it from grafana instead of a photograph