In v2019 (as well as in v2018), shift-copying an object/text/line etc sometimes goes wrong (Win10);
select an object - for instance a line
press cntr, press shift, move the object
many times there’s no problem - the object is copied to its new position
sometimes, LayOut goes into a loop where the copied object jumps between the old and the new position many times. Esc doesn’t stop it. Switching to another window sometimes does.
To constrain to an axis. My drawing have many elements in it. I need the shift or the text/object etc is not at the same horizontal / vertical position.