Configure default transfer settings in preferences.
https://winscp.net/eng/docs/ui_pref_transfer

I'm uploading php files to a server that requires the files to not be group writable. When I use "Keep remote directory up to date", it always wants to set the permissions (to group writable), so I have to go to "Transfer settings..." and disable "Set permissions" every time. I've tried looking for a way to set this permanently so I don't have to uncheck it every time, but I can't find such a setting. Can someone please point out to me where it is?

Details: SFTP with SCP fallback. Version 5.2.0 (Build 2756).

Thanks in advance.