3 button navigation seems not playing ball

3 button navigation seems not playing ball after August update (FP5).

The middle button circle, closes the app, it usually just minimises the app. If anyone knows where settings are to change what action it does, would be most helpful.

Edited update. Basically the behaviour slightly different to what i am used to. I am just used to seeing the apps that i come out of but not closed being in the centre (recent list) and scroll through them. I have paused a game in play and pressed circle, it has gone minimised to it’s position where apps icons are. But not shown in recent list. I go back to game app and it’s continuing where i left off. Is that normal expected behaviour?