Mojo's "line out" mode is 3 Vrms, so 9 Vp-p. It maintains 3 Vrms all the way down to 50 ohms so it's an overkill as a "line out".
To get 1.7 Vp-p (0.6 Vrms) that you want, the colour is around green. I usually set to blue for 2 Vrms, whereas Mojo's 3 Vrms is purple.
Some literatures mention the consumer audio line level should be 0.5 Vrms (1.4 Vp-p) and professional gear is 1.2 Vrms (3.5 Vp-p).
However, a lot of consumer gear output much higher than 0.5 Vrms, more commonly around 2 Vrms (because higher voltage means better perceived dynamic range), so you might find setting Mojo to 0.6 Vrms too quiet. For example, my iBasso DX80 does 1.6 Vrms.
In general, most consumer audio preamps should have input protection to at least 2 Vrms overload protection, just in case some idiot uses their mobile phone headphone out turned up to max volume to act as a pseudo "line out" on their boombox. That means 3 Vrms on Mojo is pretty high and can clip some preamps on loud piece of recording.
In reality most quality preamps will have much higher input voltage tolerances but the bottom line is that it will affect how it sounds.