I don't understand why the developers of lightroom mobile don't optimize the use of touch gestures! it's so annoying to have to juggle between the general settings and the "star" setting which allows you to sort your photos and put one or more stars. it's a disconcerting waste of time for a professional software, paying what's more... it would be enough to apply a certain gesture (two fingers up, down for the photos you want to include or exclude, and 2 fingers towards left or right to add or remove stars.
Please take this seriously it's really basic
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