How to switch back from speaker Bluetooth or earpeace to 'phone'

[baahver]

When in a phone call I switch to speaker, or bluetooth, I do not see an option to get back to the 'earspeaker' (not sure about the name).
I tried to tap speaker again, but nothing changes there.
But some times during an call you want to be able to have more private conversation.
Do I miss an option here?

org.fossify.phone 1.4.0 on Android 15 (Lineageos 22.2) and Fairphone 4.