Show all titles from Continue Watching
The page internally loads 20 entries in the "Continue Watching" tab but only displays a few of them, so I made a user script that shows them all and allows you to hide episodes/series.
This script adds two new options to the More Options icon ( ⋮ ): "Hide/Unhide this Episode" and "Hide/Unhide this Series". The difference is that the first option hides entries by Episode ID - so if for some reason another episode appears in the "Continue Watching" tab, it will not be automatically hidden. The second option hides entries by Series ID - so all episodes of this series will be automatically hidden.
You can show hidden episodes again at any time by pressing the "Show Hidden" button.
The script only works on internally loaded data, so it will not load subsequent unwatched episodes.