Bitcoin.conf and pruned blockchain

I wanted to edit the bitcoin.conf to prune the bc (fresh start), but with the 0.5 version i’m unable to find bitcoin.conf, is there a way to use a pruned blockchain to keep the filesize under (say) 40 gb?
I just want to run LND nodes , no mempools or other programs that need the full blockchain

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same problem here. Does anyone have the solution ? (I was just considering running btc core seperately from umbrel. ?!)