I have a Google Docs document when there were a lot of comments. These comments have been resolved, however, I still need to see them in context.
You could re-open them, but I don't really want to do that, since it would incorrectly notify many people.
So how would you show resolved comments in context without re-opening them in Google Docs document?
Click on "Comments" at the top right corner (marked in the image below). The resolved ones are listed there. Source: Link
To see the original context of a comment, click on that comment. This will only work if the original context still exists (wasn't deleted). If the original context was deleted, you can make a copy of an earlier version of the document, and view the comments there.
To complete Root's answer:
⚠ be aware that the last resolved comment won't be on the top of the list of this panel: comments seem to be sorted by date/hour of creation.
It would be nice to have an option to sort them by "last resolved/edited": if you think so too, send this kind of feedback to google (in the menu go to Help → Report a problem. You can just copy paste what I've written below). (Of course, google won't care, but you'd have tried).
in the comment history panel: add an option "last edited/resolved"
It's currently really difficult (if not impossible) to undo a comment we just resolved since the comment aren't sorted by last edited/resolved but by date of creation. So you need to know when the comment was created (which isn't really possible) and then find a way to retrieve it by reading and scrolling hundred of items, in this list that takes forever to load every few items.
Try this: In Google Docs, use the menu item: File > Make a copy
In the Copy dialog, untick the "share it with the same people" but tick "copy comments and suggestions" and "include resolved comments and suggestions".
Now you have a new, identical document where you can re-open comments without, it seems, notifying many people about it. it's not the same document, but for review purposes, it might do the job.
Another way to do this, is to export them all (regardless of whether they have been closed or deleted) to a spreadsheet, including their context (the highlighted part) as well as a link to the comment itself. This method will also allow you to filter and more easily search comment data, which can be helpful.
To do this, install the Comments Exporter Add-On, open the document with comments and create an export:
After the export, a new spreadsheet will be created in your Home folder containing all of the comment data, which will look like this:
