PySimpleGUI/docs/eCookbook/multiple-windows/two-windows-with-re-open.md

Multiple Windows - Re-open Capability

This demo uses the read_all_windows function (avilable only on the tkinter port currently)

Each window has the ability to update the other. Additionally, Window 1 has a button to re-open Window 2 should you close Window 2.

Here is how the program looks on Windows