Solution 1:
– Press the ALT and SPACE keys while you over the Lychee Slicer icon, and a little menu should appear
Solution 2: use one of those options when you right-click on the Windows taskbar (not on the icon)- cascade windows- show windows stacked show windows side by side

Solution 3:

  1. Click on the Lychee Slicer icon in the taskbar
  2. Press the keys WINDOWS + SHIFT
  3. and while you hold the WINDOWS + SHIFT keys, use the arrow of your keyboard to move the windows (you will probably need to press a few times on the  left or right to try to bring it back to your main screen, this manipulation moves windows from a screen to another screen