By default, Edge opens the PDF file.
Follow these steps if you don’t want PDFs to open on Edge:
Click on Default apps in the left sidebar.
The “Choose default apps by file type” link is located on the right. Click on it.
Then, find .pdf and click on Microsoft Edge next to it.
Select the PDF reader of your choice.
Alternatively, you can follow these steps to get to the “Default apps” screen:
Open the Control Panel.
Hit Default Programs > Associate a file type or protocol with a program.
Here is an alternate method to stop Edge as the default PDF viewer:
Right-click the PDF.
Hover your mouse over “Open with” in the context menu.
Click on the “Choose another app” option.
In the pop-up, choose the app you prefer.
Check Always use this app to open .pdf files.
Hit the OK button.