Local network access
There are two local networks in play once you are connected, and it is worth being precise about which one a setting affects.
Your home network is the one your vploq sits on. Reaching it is the entire point of the product, and it works by default whenever you are connected. The setting below does not affect it.
The network you are physically on right now, a hotel Wi-Fi or an office LAN, is the one the setting below controls.
The setting
Preferences → Local network access decides whether, while the tunnel is up, you can still reach devices on the network you are physically on: the printer in the room you are sitting in, for instance.
It is on by default, so those devices stay reachable without you doing anything. Turn it off if you would rather your connected device be fully isolated from the network around you.
Changes apply after you reconnect. Toggle it, then disconnect and connect again. The app reminds you with Changes apply after you reconnect.
When you might turn it off
The network you are on is not one you control. On an open café or hotel network, leaving the local path open is a slightly larger surface than closing it. Your home network stays reachable either way, so turning this off costs you nothing except the ability to reach devices in the room you happen to be in.
On iPhone, iPad and macOS
The operating system asks separately for permission to talk to devices on the local network, the first time it is needed. If you turned the setting on and still cannot reach anything nearby, check that this system permission was granted. The app cannot grant it for you.
The setting is remembered on every platform, and changes what the tunnel does on iPhone, iPad, macOS, Android and Windows.