Disable wifi signin popup? When I connect to a hotspot that requires signin, I don't want a popup that fills the entire screen. A simple notification would suffice.

Can this popup be disabled on Android 8?

Samsung Galaxy S9+
Short answer: it's not possible because this popup come from the SystemUI or from the Framework apk.
It's not come from a file that contain a setting, it's a JAVA runtime code.

Some customs ROMs could integrate it (not sure), but it's not the case of Android stock.