How to Compare two files using Notepad++

thxxx

How did u use the pen using red color at the end of this videos, how to enable it, Thanks

Thank you so much for your video ,it helps me a lot at last minute,i literally searched line by line for two hours ...after that I got your video😫🙏....thanks a lot for uploading this video...this is such a life savior ✅🙏

How do you copy all different lines?

so I don't have that compare option. How do I get it?