Display - is it possible to do this resize?

I'm setting up a W10 computer for a friend. It's an HP all-in-one which has the motherboard, hard drive etc, inside the 23" screen. The res is 1920 x 1080, or 16:9.

I'd like to configure her display to look like my 24" 1920 x 1200 (16:10), but I can't see how.

I don't much like wide screen monitors, even with a 16:10 format, so I have my Taskbar positioned at the right of the screen. It's loaded with 4 columns of shortcut icons so it's about 40mm wide. This results in the remainder of the screen being compressed to the left, so that it's even squarer than on a normal 16:10. In other words, the desktop display abuts the Taskbar.

I've tried doing this on the HP 23" but instead of the display abutting the Taskbar, it's visible behind it. In other words, it's not affected by the width of the Taskbar.

There must be something obvious I'm missing on the W10 computer that would enable the result I want but I don't know enough about the OS at this stage. All I can think of is that the Taskbar is still set at the default Aero-type semi transparency, whereas I've disabled transparency on my own display and set it to Windows Classic.

Anyone able to offer an insight?

Thanks for reading :)

some of those all-in-ones supports that 1900x1200 but not all. so if you have drivers installed it should do it by just switching the resolution? if it doesnt support, you prolly have to use some 3rd party drivers to shrink/stretch the picture as you want to

Batlhiz: Yes, I could probably lessen the resolution, but I think the visible screen would still be the same size. I've just checked again with my 24" Asus PA248 and W7 rig. If I drag the edge of the right-side Taskbar further to the left, to make it 50mm or even 75mm wide, the visible screen\display shrinks accordingly.

Alphanumeric: Yes, tried that. No change.

What I've done with my current screen isn't the first time I've done this with the display on a W7 or even XP system. In fact, when I bought the Asus monitor I gave my older Philips 16:10 to my wife. That's set exactly the same way. But I've only just realized how odd it is. I mean, the resolution remains at 1920 x 1200, which is normal for 16:10, but by widening the bordering Taskbar I'm effectively lessening the distance between pixels in the 1920 dimension. I guess that, taken to a silly level, it would considerably distort the displayed images. Anyway, it looks fine to me and has the advantage of lessening the width of a widescreen monitor.

The only thing I can think of that might have a bearing is that when I tune a machine for myself or a customer, I invariably change the display setting from the native W7 display (often Aero) and select Windows Classic. This drops most of the bells and whistles and results in a faster system. A side effect of this is a totally opaque Taskbar. Now, Windows Classic isn't available on this Windows 10 Home machine, and I'm not sure any of the other versions have it either. There's apparently a 3rd Party app that installs it, but I haven't tried it.

Another tweak I've always done is to go to Advanced System Settings (which so far, the only way I know how to do it on W10 is Windows key\R, then enter sysdm.cpl ,3) and under Advanced > Settings > Visual Effects, select 'Adjust for best performance'. This always helps a system run better, too. However, I've already done that on the W10 system and it hasn't affected the relationship between screen and Taskbar.