If PDFs open in the Edge browser, you may want to have them open directly in the Acrobat program. One reason you might want to do this is because you can't sign a PDF if it opens in the browser. To change this behavior, see the instructions below.
Click the Windows icon in the lower left of your screen
Type default apps and press the Enter key
Click Set defaults by app in the lower part of the screen
Click Adobe Acrobat and then Manage (if there are two entries for Acrobat, select the first one)
For any item that shows as Choose a default or Microsoft Edge, click the item and then select Adobe Acrobat.
Now, when you click on a PDF, it will open in Adobe Acrobat instead of Microsoft Edge.