I’m not sure if this is something Litchi can “fix”. I don’t own a Mac but the the ways I have heard to simulate a “right-click” on a Mac (with a one-button mouse) include:
- Control-click (using trackpad)
- Two fingers on the trackpad
- Click with thumb while contacting trackpad with two fingers
- Assign the bottom-right corner as a right-click zone in your System Preferences
- Attach a two-button mouse
I don’t know if the above will help (I cannot test them) and I’m sorry if they don’t work.
A really ugly method would be to add your POIs using the Litchi app and then open that mission in the Litchi Hub and complete the mission configuration. I hope you don’t have to resort to this.
Let us know if any of these methods work.