how to get first max or min value from table ?

This is my table:



I want to get only max value out of that, that is 71 and its date also and min value also. I am getting this table by distinct count of temperature filed.(without using expression).

I can also set it to multi row card besides table,  sort it ascending or descending so that it will show sorted rows and will resize it like this:



but user can maximize it also using the icon on top right corner. Is it possible to remove that icon(customize the title bar icon) ?

Any solution? Thanks.