Before settling on ios 13, can’t you put the option to remove the borders, and keep only the selected panels as a whole? You can see this in another reader Yacreader, it supports versions from ios 9, and it brings that option.
Example
Before settling on ios 13, can’t you put the option to remove the borders, and keep only the selected panels as a whole? You can see this in another reader Yacreader, it supports versions from ios 9, and it brings that option.
Example