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Absolutely. Sorry you had to wait almost two years for a response, I only found this forum, and in fact ML, just recently.
Thanks for your time!

[not]

Certainly. I've also redone the test without HDMI out as I encountered some inconsistency that clashed with the earlier report.

Without HDMI out:

• Turning on live view after about half a second after either leaving live view within the same mode or after switching to a mode does not bring up the overlay.
• Turning on live view at about a quarter to half a second after either leaving live view within the same mode or after switching to a mode shows the overlay.
• Turning on live view even earlier does not bring up the overlay.
• The timing feels like it varies slightly between modes.

With HDMI out:

• Turning on live view for any mode always shows the overlay.

In either case, switching between modes while the live view is active clears any overlay, if present, except:

• When switching across the groups of modes (as in the fully automated ones vs. the partially or fully manual modes P, Tv, Av, and M), the live view cannot be tested as doing so deactivates it and returns to the camera's info/config screen for the mode.
• When switching within the manual group, any existing overlay is never cleared. Presumably to continue showing the aperture and/or shutter speed and the like. That said, if you managed to turn on live view for any of the manual modes without getting the overlay (see above as to how), switching between modes keeps the screen overlay-free, but that's only "available" when HDMI out is not used.

So, any actual clearing happens effectively only when switching modes within the full auto group.

@1200D users: Can you confirm/falsify a bug in "Clear overlays" for this camera?

To test this you just need to access Display tab -> Clear overlays and use setting Always. Use a lens with AF in AF mode. Do you get a clear liveview in photo mode and clear view in video mode? Or is liveview obstructed by focus box overlay?

Hello!
To some extent, yes. The focus box and a frame with things like exposure indicator and remaining pictures appears when switching to live view after changing to a different photo mode.
But only the first time after switching to or between photo modes and then turning on live view. For any further toggles of live view while the mode is unchanged, the screen only shows the sensor feed. No overlay right away, or ever.
Also, when the photo mode is changed while live view is active, no overlay appears.
And for video, I only see it briefly after switching the camera on in that mode.

Best regards,
DP