A file may have many types of comments, many colors, many authors, etc. If one wants to hide only one variety (e.g., the color red), one has to select all but the red dot and then press the Apply button for the filtered selections.
This would be simpler if one could select only the red dot and press a new Exclude button/function. Further, Apply and Exclude could be combined to mimic an electrical (ON | OFF) switch.

For very large files with many comments, filtering consumes a lot of time. For shared files on servers, the time is magnified by the back and forth between the server and the user's pc. It would be useful to have an in progress indication that shows filtering activity or the lack thereof.