The option "Max. resolution level (1-21)" on the launchpad seems to be broken. I have tiles up to level 21 and tried to set the option to be 19, 20, 21, and I always saw tiles of the maximum available level, namely 21. Then I deleted tiles of levels 19, 20, and saw the difference (lower resolution). So, it seems the option doesn't work properly. But I saw the difference (lower resolution) when I set the option to be 16, although I'm not sure the tiles of the level 16 were displayed.
The option "Max. resolution level (1-21)" on the launchpad seems to be broken. I have tiles up to level 21 and tried to set the option to be 19, 20, 21, and I always saw tiles of the maximum available level, namely 21. Then I deleted tiles of levels 19, 20, and saw the difference (lower resolution). So, it seems the option doesn't work properly. But I saw the difference (lower resolution) when I set the option to be 16, although I'm not sure the tiles of the level 16 were displayed.