i'm curious about the "notch", sometimes found at the screen boundaries, that catches the mouse.

The first problem in the way here is that one of my screens is inconsistent about it's geometry. On bootup, VGA-1 reports "1360x768". Once configured, either with xrandr or systemsettings5, it subsequently reports "1366x768". So not surprisingly systemsettings5 Display Configuration doesn't manage to line up the right edges. Tho i can line them up with

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xrandr --output HDMI-1 --mode 1920x1080 --output VGA-1 --mode 1360x768 --pos $((1920-1366))x1080 --output eDP-1 --mode 1366x768 --pos $((1920-1366))x$((1080+768))

So an enhancement suggestion would be for systemsettings5 Display Configuration to accept coordinates for alignment.

i'm happy that with xrandr i can arrange my 3 screens vertically with the right edges aligned, such that, keeping the mouse against the right edge, i can freely glide the mouse past both screen boundaries, without "getting caught" at the boundaries, whether going upward or downward. Thus, no gotchas while using a scrollbar, the mouse doesn't get caught.

As the top screen is wider the left edge is of course different between the top two screens. Going downward, there's a big corner. Coming out of the corner, following the bottom of the top screen, when the mouse reaches the beginning of the middle screen it falls right into it. And going upward along the left edge, the mouse glides right past the boundary into the top screen.

What's odd is the boundary between the bottom two screens. Remember there's no catch on the right edge. Keeping the mouse along the left edge, if either screen was even slightly wider than the other, you'd expect the mouse to "catch" in one direction, and go freely past in the other, but keeping along the left edge, it "catches" in *both* directions, upward and downward, at the boundary between the bottom two screens! So there's a "notch"? Is that intentional? Since the scrollbars are on the right it's less of an issue but does "catch" me surprisingly often, leaving me wondering where the mouse went.

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 $ xrandr
Screen 0: minimum 320 x 200, current 1920 x 2616, maximum 16384 x 16384
eDP-1 connected primary 1366x768+554+1848 (normal left inverted right x axis y axis) 344mm x 193mm
   1366x768      60.01*+
   1280x720      60.00    59.99    59.86    59.74 
   1024x768      60.04    60.00 
   960x720       60.00 
   928x696       60.05 
   896x672       60.01 
   1024x576      59.95    59.96    59.90    59.82 
   960x600       59.93    60.00 
   960x540       59.96    59.99    59.63    59.82 
   800x600       60.00    60.32    56.25 
   840x525       60.01    59.88 
   864x486       59.92    59.57 
   700x525       59.98 
   800x450       59.95    59.82 
   640x512       60.02 
   700x450       59.96    59.88 
   640x480       60.00    59.94 
   720x405       59.51    58.99 
   684x384       59.88    59.85 
   640x400       59.88    59.98 
   640x360       59.86    59.83    59.84    59.32 
   512x384       60.00 
   512x288       60.00    59.92 
   480x270       59.63    59.82 
   400x300       60.32    56.34 
   432x243       59.92    59.57 
   320x240       60.05 
   360x202       59.51    59.13 
   320x180       59.84    59.32 
VGA-1 connected 1366x768+554+1080 (normal left inverted right x axis y axis) 256mm x 274mm
   1360x768      59.95*   60.02 
   1024x768      75.03    70.07    60.00 
   800x600       85.06    72.19    75.00    60.32    57.90    56.25 
   640x480       75.00    72.81    59.94 
   720x400       70.08 
HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 698mm x 392mm
   1920x1080     60.00*+  59.94    30.00    24.00    29.97    23.98 
   1920x1080i    60.00    59.94 
   1680x1050     59.88 
   1280x1024     75.02    60.02 
   1440x900      59.90 
   1280x960      60.00 
   1360x768      60.02 
   1280x800      59.91 
   1152x864      75.00 
   1280x720      60.00    60.00    30.00    59.94    29.97    24.00    23.98 
   1024x768      75.03    70.07    60.00 
   800x600       72.19    75.00    60.32 
   720x480       60.00    59.94 
   720x480i      60.00    59.94 
   640x480       75.00    72.81    60.00    59.94 
   720x400       70.08 
DP-1 disconnected (normal left inverted right x axis y axis)