Extending Recently Viewed & Recently Compared Grids

I am struggling to extend the following two files in mageno 2.3.1




I tried extending them at:




I then ran setup:upgrade and setup:static-content:deploy -f

But no changes took place.

To troubleshoot I then tried editing the files in their original location. Ran “setup:upgrade” and “setup:static-content:deploy -f “

But still no changes?

Are these files no longer used?

To clarify it is the blocks that are inputed into the TinyMce Editor as below image. enter image description here

Any Help much appreciated.