Extender Mode: Does it also bridge to the LAN port(s)?

If I use Extender Mode to extend the range of my network, does it also bridge the LAN ports? i.e., if I have non-wifi equipment plugged into a device configured as an extender, will those devices be able to access the network?

Also, does the UI go away completely? There’s a warning before activating the mode, which says,

When you use Access Point / Extender / WDS mode, you will not be able to connect to this UI again. You can press and hold the reset button for 4 seconds to revert to router mode.

Is that correct? I can’t see the reason why it would be true. Does it actually mean that I’d need to use whatever new IP gets assigned to the Extender through the primary access point?