Hi @Dmitry Mi, thanks for reporting the issue with the blank space in the left side bar. Our development team is investigating, we hope to have the fix available soon to you all.
As for the Apple Pencil strokes issue, we partially fixed the issue in 10.0;4 - it should be completely eradicated in an upcoming release. While we work on a permanent fix, disabling Scribble in iOS Settings > Apple Pencil > Scribble should solve the problem.