You could install the SailfishOS Patches (Formerly known as Pandora), you can add toggles to the Event View screen. So you can disable your network connection at the Event View screen. (The screen where you swipe up from the bottom of the screen)

When you select "Connect to Internet" again, you can just select the Connection you want, even if the toggles are disabled.

I know it's a workaround, but it does work

Download Sailfish OS Patches: https://openrepos.net/content/sfietk...tches-advanced

Remember that toggles does not let you switch between connections