Is your feature request related to a problem? Please describe.
This feature is a problem for my server. We have events where certain builds and areas are hidden and meant to be found by players. Having a spectator view that all can access defeats that purpose.

Describe the solution you'd like
I would like to have an option in the BlueMap config or the web/data/settings.json to have the option to disable the free flight button.

Thanks! :)

Added in 1.5.5

That option is planned,
but note that your players will then still theoretically be able to modify or trick bluemap into moving the camera underground.