In Start: Select image processing option: Align
In PageFrames:

1. have a look at red frames of each page: make sure that red is around all printed content and close to edge of pritspace.
2. then look for largest page of the document (greatest height and greatest width) and set as print space (enter manually or click button "Set as printspace")
3. add a marging of e.g. 5 mm. That means that docWORKS[e] will cut on each original page a frame of the size of the red frame plus the marging. All exported pages will have same size.
4. activate blue frame (button at top on center tool bar). The blue frame indicates the final page size and the area that will be cut on each page.
5. in case there are pages with status "Suspicious page", you can either chage status to "individual page size" (then page will not have same size as all the other pages) or can adjust the margin (see above) so that every blue frame is large enough to cover entire red frame  on each frame.

Option 2: each image will have individual size.

Select image processing option: Align
In PageFrames:

1. in list of pages (bottom right) select all pages in list by holding Shift and clicking on first and on last entry in the list.
2. right click on any of the items in the list and mark as "individual pages size". All pages will have individual pages size in export, according to red frame  on each frame.
3. double check red frame on each page so that all it covers all relevant content and additional area around the content (print space) that you like to have on the exported image. All aread outside red frame will be cut away (deleted).