When I use split view on my 10.5” iPad I tend to use it at 2/3 + 1/3. However, every time I open a new window it splits 50/50 and I have to adjust it manually (I think it use to remember the last setting in previous iOS versions).
Is there a way to default to the split view size?
There has never been a setting, AFAIK, but it definitely used to default to 2/3 and 1/3 and switched in iOS/iPadOS 13 to 50/50.
I always wanted it to be 50/50 so I liked the change, but after having it be the other way for so long, it definitely should be a user-configurable setting, except that Apple doesn’t like user-configurable settings much anymore (and never did on iOS).