During setup
The last screen of setup says You’re all set and gives you three tick boxes, all ticked to start with.
Untick the first one and your current default stays as it is. You can come back
to this whenever you like.
Later, from Settings
OpenSettings > General. If Ve isn’t your default yet, you’ll see a banner at
the top reading “Ve works best as your default browser” with a Set as
default button. Once Ve is the default, the banner goes. There’s no separate
toggle to hunt for.
Later, from a new tab
You’ll see the same offer as a strip on the new tab page, with a × to dismiss it. Dismiss it and it stays away for five minutes, then comes back if Ve still isn’t your default. Once it is, you won’t see it again.What macOS does
Pressing Set as default doesn’t flip anything on its own. macOS puts up its own confirmation dialog, and nothing changes until you answer it.
Ve keeps checking in the background while that dialog is up, so the banner
clears itself once you confirm. You don’t need to reload anything.
Want to switch back? Set the other browser as your default from inside it, or
from System Settings.