Windows 10: Taskbar pinned running program marker line problems

Hi
I've got two problems with the line next to the running programs on the taskbar of win10.

I use the taskbar on the left as I always did (monitors are wider than tall). I use a lot of pinned programs, too, for an easy start to the day.
Some programs are running, and usually I'm getting a thin, accent-coloured line next to them.

Problem 1:
This line is very thin and it's on the edge of the screen, so it's not very useful (win7 was much better highlighting the running programs)
Screenshot to illustrate the problem:


(mind you it looks much better here; on the monitor it's off to the far left, hence it looks about half as wide)

And problem 2:
if I change the "Scale and layout" to anything custom (advanced scaling settings, enter a custom scaling size, reset computer) then these lines completely disappear.

The sad thing is that I'm using a 43" 4K screen here, and 100% is too small, 125% too large, 110% is ideal - and guess what; it's a non-standard scale.

I'm wondering if there's any way to make the line thicker, make it always appear, or even better; return to the win7 way of highlighting the icons?

Thanks in advance

:)

 

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I pinned a program to the taskbar, however, it doesn't stay minimized in a way that upon clicking on it it opens back up.

I am attaching a screenshot.

I need to actually right-click on its icon in the taskbar and then click on its name in order to open it.

Usually icons of programs pinned in the taskbar will have thin blue line underneath which marks it is running.

I tried all settings in the program itself but none seems to work, so I am wondering if is a Windows issue

 

windows 10 home missing pin to taskbar for installed applications

I added a third step to the first suggestion, which worked for me:

1. Choose start> All apps,

2. Scroll to the application you want to pin, right click and then click
Pin to taskbar.

3. When the desired icon tile appears in the desktop box, left click on it and drag it into the task bar.