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Where in the app do I got to pick themes?

Under https://lichess.org/training on the left side pane there is a "Puzzle Themes" link (takes you to https://lichess.org/training/themes).

I think this functionality is not available on the app, only on the browser version. The browser version runs great on mobile, though.

Gotcha thanks, I exclusively use the app, but for puzzle I think I can branch out. I prefer tap to move as opposed to mouse.