You can open this form directly, by pressing Layouter.BitmapAndLinks icon 
then select restore links tab.
Within this tab, you can see all of bitmaps which are embedded in documents which and are ready to make them externally linked. That means that every bitmap in this list has got additional information about the source of file. This is required for automatically get the proper file, import it again as externally linked bitmap and replace the embedded high-res version of image. This list searching is limited to the chosen range of pages. On the right side is the text box displaying information about the chosen file from the list.
You can choose a desired range (current page, pages FROM - TO, all) in the Range frame placed at the bottom.
Read more about pros and cons of using externally linked bitmaps.
Note, that you can't restore bitmap link with use of native CorelDRAW® interface after you had resolved it. You may restore links only for bitmaps which had been imported using Krasbit Layouter import macros.
Usage of buttons:
refresh list
This button refreshes the list of files for active document, range and scope.
show selected item on the workspace
This button display the relevant page and makes bitmap selected for the chosen item. You can use it to quickly localize on the stage items that has been displayed in the list.
restore link to selected item and make bitmap externally linked
This button restores link for selected item on the list. If you press it then embedded high resolution image will be replaced by externally linked bitmap.
restore links of all items in chosen range and make bitmaps externally linked
This button restores link for all items on the list. All of embedded high resolution images in chosen range will be replaced by externally linked bitmaps. Use it for batch restoring bitmaps links while working at document with large amount of high resolution images. That will improve performance of editing and reduce the size of project file.
Keep aspect ratio option
If this checkbox is ticked then resolved bitmaps will get the aspect ratio from modified source file. Otherwise, resolved bitmaps will remains previous aspect ratio, which may results in disproportion if the source file had been changed aspect ratio.This settings matters only if the source bitmaps had being changed while working with this tab.
export list of all bitmaps
Press this button to export current list of bitmaps and related information to the text file. The file will be placed in the folder where the active document file exists.
RELATED SHORTCUT ICONS
restore link to selected bitmap and make bitmap externally linked
macro: Layouter.restoreLink
This macro restores a link for the selected bitmap on the stage and replaces embedded high resolution image with externally linked bitmap.