In the Grid view, you can choose to view a flat grid or segment photos in the grid. Further, you can sort the photos by capture date, import date, modified date, and more.
Tap the three-dots icon () located at the upper right of the Grid view. From the context menu that appears, choose any of the following options:
Segmentation > None, Auto, By Years, Months, Days, Hours, Flags, Star Ratings, and File Types.
When you enable this option, Lightroom for mobile segments the grid photos By Days (default). You can also choose more segmentation options—By Years, Months, Hours, Flags, Star Ratings, and File Types.
Sort By > Capture Date | Import Date| Modified Date | File Name | Star Rating
Select one of these sorting options to reorder the display of photos based on the selected criteria. Clicking the option again toggles between ascending and descending orders.
Sort By > Custom
Use this sort option to manually reorder your grid photos.
Tap the edit icon beside the Custom Order option, to show the Reorder panel. Long-press a photo and drag-drop it to the desired location. Tap the Custom Order option again to toggle between ascending and descending orders.