I have tried the new split spell list for spell casters and I DO NOT like it. 
If I have Spell X learned on one list and I'm looking for a new spell to learn on the other list Spell X will be an option. So now I have to compare two or more lists. Also, if I want to see what spells I have to create a magic item I have to look at different lists. I am now forced to keep a spreadsheet of my spells so I have one place to look instead of two or more. So I have some suggestions for the players who want the spells to appear where they are located.
1) Allow us to toggle between the split lists and a single list.
2) Give us another button that will show us one list of spells learned.
3) Return to one list but set it up like containers for gear.
I would prefer the third suggestion. I don't know anything about coding but maybe it could be designed to indicate when too many spells are put in the free section, too many in a spellbook, etc.; like the way gear is set up to show when someone is carrying too much and when the gear is dropped to the ground. And like gear when another spellbook is bought it appears as another "container" for spells to be put in. Then there's no chance of duplicating a spell already learned. (For those of you who might argue about a traveling spellbook, witches don't need spellbooks.
)
If I have Spell X learned on one list and I'm looking for a new spell to learn on the other list Spell X will be an option. So now I have to compare two or more lists. Also, if I want to see what spells I have to create a magic item I have to look at different lists. I am now forced to keep a spreadsheet of my spells so I have one place to look instead of two or more. So I have some suggestions for the players who want the spells to appear where they are located.1) Allow us to toggle between the split lists and a single list.
2) Give us another button that will show us one list of spells learned.
3) Return to one list but set it up like containers for gear.
I would prefer the third suggestion. I don't know anything about coding but maybe it could be designed to indicate when too many spells are put in the free section, too many in a spellbook, etc.; like the way gear is set up to show when someone is carrying too much and when the gear is dropped to the ground. And like gear when another spellbook is bought it appears as another "container" for spells to be put in. Then there's no chance of duplicating a spell already learned. (For those of you who might argue about a traveling spellbook, witches don't need spellbooks.
)