Not able to change timeSeries column name to "current" in grafana v10.2.3

Question

I have this grafana version 10.2.3.

grafana v10.2.3

In above, I want to change Last to current, but I am not able to do that, I tried changing the query like this

select "value" as current from myTable; 

select last("value") as current from myTable;

but nothing is working, can someone please guide me how to change since I am newbie with respect to grafana setup?

Even I tried selecting drop down but there its not possible.

drop down