Zoom's screen share never sees the overlay
Whether you share your whole desktop or a single window, Zoom gets its frames from the operating system's capture pipeline. Lexora's overlay is excluded from that pipeline, so it is absent from what Zoom transmits and from anything Zoom records.
This holds for Zoom's cloud recording and local recording alike, because both are downstream of the same capture.
Audio straight from the Zoom process
Lexora taps Zoom's audio output directly rather than listening through your microphone. That means no echo, no room noise, and no need to keep your speakers turned up.
Your microphone stays entirely free for you to talk into, which also means Lexora never transcribes your own answers back at you.