Once PDF Expert is downloaded and installed you are able to make the app your default reader for all PDF files. There is an easy way to do it:
- Open PDF Expert, tap PDF Expert in the upper menu and select Preferences.
- In the “Default PDF Reader” section, select PDF Expert from the list.
Afterward, every time you double-click on a PDF file in Finder, it will be automatically opened in PDF Expert.
Note: if you purchased PDF Expert in the Mac App Store, you can make it your default reader if you right-click on any PDF file > "Get info" > Open with > choose PDF Expert > Change all.