Dear @Bob ,
Good day! Welcome to the Microsoft Q&A forum!
Based on your description, I understand that the tracked-changes/comments area is taking up a large portion of the screen in Word for the web, making collaboration difficult.
In Word for the web, try changing the document from Reviewing to Editing mode using the mode selector at the top of the document. In Editing mode, your changes will not be shown as tracked changes.
If you still need Track Changes enabled but want to reclaim the screen space, the available display options are more limited in Word for the web than in the desktop application. If you have the desktop version of Word, select Open in Desktop and use Review > Show Markup > Balloons > Show All Revisions Inline. This displays revisions within the document instead of using the large margin area.
If the issue is specifically with the current Word Online interface and these options are not available in your version, please let us know whether you are seeing tracked-change balloons or the Comments pane, as the solution differs between the two.
Thank you, and I look forward to your update.