Should be the three dots at the top right, Settings -> general -> Advanced Mode
I don't know why I'm not seeing it, but here's what I see under Settings -> General
On Launch Privacy Legacy URv1QR.
I'm using version 7.0.4, android apk.
In any case, my problem was solved with putting the correct type of public key in there (thanks @Radentor). So I didn't need to go into Advanced mode to mess with the derivation path...
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