The keyfob can be coded to globally open/close the windows (and moonroof) on a press and hold of the relevant button on the fob. It's a customisable option and needs to be done by the dealer. It will be detailed in the handbook
My concern would be replacement cost and I would definitely inform my insurer of the option as fitted.
Any ballpark comparisons on costs between standard glass mirrors and these digital ones?
Simply grip the edges of the restraints and pull forward. They click into 4 presets and if you pull again they right back to the furthest rearward and so on
And if Lexus didn't want it there it would have been engineered out.
The 'mask' is there to prevent the driver using the camera when driving, as noted in the link given in post #2 by Herbs