Please answer the following questions for yourself before submitting an issue.
AdGuard version
4.1
Environment
Root access
What filters do you have enabled?
No response
What Stealth Mode options do you have enabled?
No response
Issue Details
Steps to reproduce:
Go to Protection tab -> DNS protection -> DNS filters -> Add DNS filter -> Browse -> select the DNS filter file
The "URL or path" input field is completely grayed out
Expected Behavior
The input field is not grayed out when added
Actual Behavior
The input field is grayed out when added
Screenshots
Screenshot 1:

Additional Information
When you select a protocol for the DNS server, the tabs are also toggled