revert back to the old version before the update
The new update is so inefficient, you split up the tool bar which takes up more space, and it makes me feel like there's always a visual barrier at the top which is extremely distracting. listen to the feedback from many of the unsatisfied users, and quickly implement a change. Or, have options for some users to try the new update, or revert back to the old version if they don't like it. Don't just keep the new update simply because your company spent too much time or money on it and you don't want it to go all to waste. Your selling point is that customers love the convenience of this note taking app, keeping updates that users don't like will only make your customers unhappy. Thousands of other apps are available, such as Notability, Freeform, etc. Listen to your customer feedback