What does Keep Selection Mode setting do

[Ayo]

What (when) does the Document Editor 'Keep Selection Mode' setting do?
Can't notice any difference when I work vice versa between Transform Tool and Shape Editor for example. Object always keeps selection.

[pentool]

1. In the Preferences > Document Editor deselect "Keep Selection Mode". Close dialog.
2. Draw a shape
3. Press V to select the Transform Tool. At the top toolbar select the "Direct Selection" tool. It's the second from the left.
4. Press P to select the Pen Tool.
5. Press V to select the Transform Tool again. Notice that instead of the "Direct Selection" tool at the top toolbar, now the default Pointer Tool is active. In other words, the transform tool got reset.
6. Now go back to Preferences > Document Editor and select "Keep Selection Mode". Close dialog.
7. Press V to select the Transform Tool. At the top toolbar select the "Direct Selection" tool. It's the second from the left.
8. Press P to select the Pen Tool.
9. Press V to select the Transform Tool again. Notice that the "Direct Selection" tool at the top toolbar is still selected. It didn't get "reset" back to the Pointer Tool.

See video here:
https://www.youtube.com/watch?v=OshOmdyay64

[Subpath]

@pentool

thanks for the video
didnt know this too