The chart toggle button in the lower left, (on Android anyway), used to simply cycle through the various charts available for the type being displayed. For example, for sectionals in the northeast, each press would switch to New York, then Montreal, then Halifax, then Detroit, etc. (maybe not in that order, but you know what I mean). It was quick. One press and you are on the next chart.
With the advent of the seamless charts, the buttons' role is a little different, but I think it could be just as quick (maybe even better than before), but it's not. They way it is presently implemented, the first push pulls up a menu, (often with only 1 option available), then another press pulls up a list of available charts, or seam switches, then a third press makes the selection. Three presses to try a new seam location. And if the first one didn't get what you want, it's three more for the next try, and so on. If one happens to be flying in an area with 3 overlapping options, it could take 9 presses, and the attendant distraction of reading menus and options, to try the other two seam cuts, only to decide that what you had in the first place was already the best option. With the old functional mind set, it could be 3 presses, with no more than a glance to decide if you like the change.
Could the toggle button go back to simply cycling between the available options one after another? This could even be better than before, because with seamless charts, the toggle would only be cycling through the charts and seam cuts that are applicable to ones location and zoom level, vs. cycling through all downloaded charts of that type.
Just my two cents. Thanks,
Jim