Hi HollyWilliams6,
Thank you for updates.
It seems that the default location for inserted pdf icon is “C:\Program Files (x86)\A... \Acrobat.exe” if you had set up Acrobat.exe as the default app for pdf files.
However, I don’t install this app and I don’t have the issue. And my default app for .pdf files is set to Microsoft Edge.
So, if you want to change the location sticks, please make sure you have set the Acrobat.exe as the default app for .pdf files. To check this, please type” default app” on the search menu and hit enter then click “Choose default app by file type”. And please make sure the app is up to date.
If your issue persists, to narrow down, please try the following methods:
Method 1: Please try to change another app (For example, a web browser) as the default app for .pdf files.
Method 2: Please update your Excel to the latest version. (File>Account>Update option>update now).
Method 3: Please try to use another User Account on your Windows to see the result.
For your references: Add or remove accounts on your PC
How to switch users (accounts) in Windows 10
If you’re the above method doesn’t work for you, may I know where did you downloaded and installed Office?
Best Regards,
May