Happy New Year, all! 
In the GUI Editor, I tried setting a box at position (0, 0). However, after unselecting and reselecting it, it almost always shifts slightly. And I also cannot undo by pressing Ctrl + Z or Command + Z.
Please see the video attached below.
Thank you for your help!
cc @georgie
Hi @regna I have not been able to reproduce the behavior shared in your video. Same for others on the team. Are you only seeing the behavior when responsive is checked? Is there anything specific to your device settings that could be impacting screen resolution, DPR, etc?
Regarding ctrl z not undoing-- that feature has not been implemented in GUI editor
Thank you for looking into this, georgie! Let me check out the different options and see