On 21/03/2021 18:36, Andrew wrote:
On 21/03/2021 18:20, Roger Mills wrote:

No response so far from the Windows community - maybe uk.d-i-y can help?

-------- Forwarded Message --------
Subject: Odd screensaver behaviour
Date: Sat, 20 Mar 2021 23:12:05 +0000
From: Roger Mills
Organization: Association of Revolting Peasants
Newsgroups: alt.comp.os.windows-10

I've just set up a new W10 desktop machine with two monitors - the
main one landscape for general use and the second one portrait for
displaying A4 sized documents in actual size. For obvious reasons, the
monitors are configured as "Extended these displays" rather than
"Duplicate these displays".

I've set up a screensaver in the form of a photo slide show. When the
portrait monitor is on the right and the screensaver cuts in, its
screen goes blank and the slideshow takes place on the main
(landscape) monitor - which is fine.

However, when the portrait monitor is on the left and the screensaver
cuts in, the photos are half on each monitor with black space outboard
of them.

Anyone come across this, and any suggestions for fixing it? [OK I
could put the portrait monitor on the right but I really *want* it on
the left].

How does Windows know where you monitors are ??.

You tell it that when you set it up for dual displays - it needs to
know, so that when you move the cursor off the right edge of the left
screen, it moves onto the left edge of the right screen and vice-vera or
to display a window that is straddling the two screens.

If Windows is treating both as one big monitor, having one in
landscape and t'other in portrait is going to confuse it anyway,
surely ?.

It doesn't quite treat them as one big monitor. On my own (working from
home) setup, I have the laptop (1920x1048) on my left and my personal
monitor (2560x1440) in front of me - okay, both landscape, but the
different resolutions have the same effect.

If you zoom a window to full screen, it zooms to the full extent of the
screen that it is (mainly) on, not across both screens. If you drag a
window to straddle the gap, it acts like an L-shaped monitor - so
something that is almost the full height of my laptop screen with only
cover around 2/3 the height of my main monitor. Indeed trying to move
left off my main monitor onto the laptop screen only works on the top
2/3 of the monitor, with the cursor getting stuck at the left edge for
the bottom third.