PDF Expert 6 has a range of zooming modes for your convenience. They are well adjusted for working effectively at your own pace.
There are three zooming modes in the app:
1. Fit Width - zoom out slowly until the page doesn't move and covers the whole space on the screen.
2. Fit Annotation Tools - zoom in slowly until the toolbar is the desired size.
3. Fit Page - zoom out to maximum to display the whole page.
All three modes are designed to fit various schemes of working with PDF files.