What does "Show all fields when parent footprint is selected" do?

May I know what this option “Show all fields when parent footprint is selected” do?
Check and uncheck it doesn’t seem to have difference.

Please . . .

Can you paste your full version info here please, you can get it from KiCad > Help > About KiCad > Copy Version Info
image

It’s the latest 9.0.4 release build.

OK, but can you please do as asked.