Which feature helps to insert the contents of the clip board as text without any formatting?

The way I do this is to open Notepad, paste the text into it to remove formatting, and then copy the text back out of Notepad. Once you get used to it, it can be a very fast control-v, control-c in Notepad to remove formatting, and then control-v where you want the text to go.

If you are doing many copies, just leave Notepad open. Each time you have new text, click on the Notepad session. To get rid of the previous text you just add one control-a (when necessary - usually not) before the above.

The overall then goes select what you want to copy, control-c, click on Notepad, control-a, control-v, control-c, click on the destination, control-v. It is always the same sequence, so you get to where you can do the whole sequence very quickly.

This works for many sources, but does not always work for copies from web pages.