Can I downgrade to the previous version?

The new one is making my studies stressful. If I pull the page a little up the top tab to shows up and changes the document leves, and it is happening a thousand times per day! Moreover, to get to the ”pen tool” it is now less natural, fisrt the pen is at the botton righ them when you touch, the pen tool bar comes at the top right them when you are done the done is at the top left... There are many things that make me really regretful fot having upgraded my device.