You can designate a region of interest (ROI) by selecting an XYZ location at a zoom level of your choice and creating a bookmark.
A bookmark is a hyperlink to the ROI that you can share with other Biolucida users.
The new bookmark is added to the Bookmarks panel, under the name of the
Creating /editing/deleting bookmarks requires an Administrator account or a Viewer account with Maintainer/Full role (see About Biolucida users).
Also see Annotations, Organizing images