Hi Zeealice, I tried what you suggested (deleted all the content in markers.xml and saved it so to make it void), but this way I got a crash to desktop.
Concerning Shadows Realism mod, I already tried it - it only deletes some markers (enemies, friends) and does not affect crosscom orders markers at all.
Thank you anyway for your answer.
Following topic 45951 in this forum, I could get rid of the blue diamonds by modifying markers.xml. I wonder if any additional modification to the same file or other file can delete the "move to" orders markers (those "blue frisbees" on the ground..).
Any help would be greatly appreciated.