You may want to delete all comments once the issues they were flagging up has been resolved. You can only delete comments that are attached to target segments and not comments attached to source segments.
If the Comments window is minimized at the bottom of the side-by-side Editor as a tab, select the Comments tab.
If the Comments window is not displayed at the bottom of the side-by-side Editor as a tab, select View tab, and then in the Information group, select Comments.
In the Comments window, select Delete All Target Comments in Active Document.
All the comments that are attached to target segments in the currently open file are deleted. This operation does not delete the comments attached to source segments.