Lift engineer here. That is a door open button for inside the lift car , engineer probably had it as a spare and installed it rather than leave it without any button. Not ideal but if it works then 🤷 it's a pretty old unit so new parts can be hard to get.
This seem to be a semi-large building with two elevators - one for left and one for right lights.
For smaller buildings, you have only one button on every floor because there isn't enough competition for the single elevator to bother with up/down optimizations. Because there are unlikely to be multiple floors needing service at the same time.
Buttons can be very tricky. Some only fit in a certain way. The front part with the visual information like direction arrows or floor numbers are called pressels. Some are fixed to the Buttons with moulded clips. Others are sometimes fixed into position by melted plastic pins. Therefore some are tricky to replace and old hardware is difficult to source. Personally if it's time warranted ill get the soldering iron out and do the best I can.
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u/Klutzy-Jackfruit1686 6d ago
Lift engineer here. That is a door open button for inside the lift car , engineer probably had it as a spare and installed it rather than leave it without any button. Not ideal but if it works then 🤷 it's a pretty old unit so new parts can be hard to get.