Pyinstaller keeps thread running

[pythonuser_0101]

Hello all . . .

Can anyone help with a Pyinstaller question?

I've built a Tkinter executable with Pyinstaller - it works fine ( apart from being 20MB in size from a 10KB source . . .)
But . . . When the user closes the window to exit the progam it keeps running in the background - two instances in fact as can be found in Windows Task Manager

I've tried every combination of exit() sye.exit() etc etc but no luck.
Is there a simple fix I can build into my code?
Many Thanks for any info

[buran]

This sounds like problem with your Tkinter code, not pyinstaller
Post your python code in python tags. Also if you have edited your .spec file - post it

[pythonuser_0101]

The Tkinter section of the program ends with root.mainloop() - without which it causes all kinds of problems in the IDE which I use i.e. Thonny.

Running my prog direct from Python, or within Thonny, all is well.
But the Pysinsaller generated .exe file keeps those (hidden) threads still running.