Laptop not switching to "High Performance" mode while plugged in

Before when I used to plug in my laptop, the laptop used to go into "performance mode". This was visible because the screen colors looked more vivid and gave better fps while playing games. But now, after plugging in, the laptop stays in the same state, no color change or better fps. I've checked all the settings for better performance when plugged in(Battery, Dell Power Management, NVIDIA control panel) but no success. Even did a full reset and nothing happened.
I figured this could be a power options issue, but there the default settings had no additional settings for this. So, checking the forums here, I came across Restore Missing Default Power Plans in Windows 10. This did not solve my issue, and later came across this thread https://www.dell.com/community/XPS/N...s/td-p/7192006. There was no CsEnabled settings in my registry editor.

My Laptop is Dell Xps 15 9570.

Paul Black said:

Hello @TheKP,

Welcome to TenForums!

Have you had a look at this? => Power Plan Settings in Windows 10

I do not have the high performance mode to access those options. Have to enable it first

Bastet said:

If you click on the power icon in the taskbar does it show a slider where you can change the power from Battery, Balanced to Performance?
I believe Windows 10 removed Battery & Balanced power plans in favour of the slider.

That is the problem, the slider does not work, it's the same whether it's power saver mode or best performance. This is why I'm looking for the high performance power scheme, where I can edit the specific options.

The slider does move but there is no difference whatsoever

Checking fps in-game