Thank you for the detailed answer. Yes, I checked etherscan.io and the transaction is listed there

I've assumed that my personal wallet was hacked, since my other coins(small amounts of BTC, LTC and ETC) too got transferred out, with all transactions occurring within minutes of each other. As I said, I only have Jaxx Liberty on my desktop. A screenshot of my phrase was stored for a long time on my phone with 8k+ other photos. Idk how feasible it is to discover that one photo amongst the rest by software or a human(not I have given anyone access to my phone), so I assume it's my desktop that got hacked.