Here are the steps to help you to change the default program.
Step 1: Right-click any PDF file and choose "Get Info" from the menu that opens.
Step 2: Please choose your preferred application from the "Open with" and click on the Change ALL buton.
Step 3: In the subsequent dialog box, click Continue.
After that, the default apps for opening PDF files will be changed to the application you selected.
How to modify the default apps for opening PDF files on Mac?
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