Can't add website in IE Compatibility View

IE Compatibility View cannot add a website and prompts for an invalid domain. This article will detail how to fix this problem.

Solution:

1. Press win+r to open the run window, enter regedit and press Enter to open the registry editor, as shown in the following figure:
   
2. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\BrowserEmulation\ClearableListData, delete UserFilter, as shown in the following figure:
   
3. Then reopen IE, set compatibility view, and add the website!