Plot labels are sometimes hidden when changing devices

[hacknus]

When you connect device A which transmits 5 columns and then later one reconnect device A but now it transmits 6 columns, the sixth label is hidden. A "reset labels" is required, but then we need to re-enter all previous 5 labels.

Desired behavior: keep old labels and add a new one "Column 6".

once this issue is fixed, we can bump the project up to version 1.0.0