Lava-Liz
You mean the background layer?
《Ş̸̛̠̅̂̏͂͛̂̍̓͐̑͒͑̂͑͘͝p̶̖͍̍...
I mean when you make another frame, the sketch turns into an onion skin and then you can make line art without going through the pain of all that erasing