i am talking about this setting:

i tried so far:

spark.executor.cores 8
and
spark.log.level INFO
Both documented here: https://spark.apache.org/docs/latest/configuration.html
but neither i see effect nor i see them set if i check sparkui -> environment tab. there the settings are not set at all.
here the details of an actual run:

Am i doing it wrong? Or is it reset/ ignored for some other reason?
So how to set specific spark settings - in environment, NOT in code?