Change default program for PDFs

  1. Right-click on the PDF file

  2. Choose Open with .... from the menu, then select Choose another app



  3. Select the program you want to be as your default program (the program that is opened when you open any PDF) and then check the box Always use this app to open .pdf files



Change default Web Browser program

  1. Click on the Search icon and type default apps


  2. Click on Open for Default Apps 



  3. Click on the Web Browser



  4. Select the default web browser you want (program used to browse the internet)