Make Drawboard PDF you default viewer on macOS – Drawboard Help Centre

Drawboard Projects

Select any PDF file from Finder. Right Click or Control-click to open the menu > a new menu will open next to the file name.
Choose Get Info from the menu > a new window will open with information on that PDF file.
From the Open with: section in the new window that opens, select Drawboard PDF > that file will now open in Drawboard PDF.
Click the Change All button in the subsequent dialog box, click Continue . Now Drawboard PDF is your default viewer for all future PDF opens.
That’s it! Now when you open any PDF document, you’ll have a host of Drawboard PDF tools at your fingertips to help you work faster and better.

Drawboard PDF