§Windows any version§
.
The Issue can be generate in three points:
Browser or the Software you are using, Windows, Nvidia.

I'll use Brave browser as a software for example, ... the same settings can be found in Chrome, Firefox, Edge, Opera etc...

1) First check your Brave > is it using HDW acceleration in Settings ???
brave://settings/system
Search “Acce” then > disable Hardware Acceleration.



After restart you Brave or you can kill it via Task Manager.
If that’s not enough to solve the blurriness we have two more way to go:

2) trying via Windows
Right click on you brave Icon and choose properties:





Then follow picture going to Compatibility tab:



Change Dpi checking the first option then selecting System (enhanced) on the second one



Click ok, ok ,ok - when everything is closed - Restart your Brave

Not yet the very perfect results ???
Let go to Nvdia then !!!

3) Right click on desktop choose Nvidia Control Panel
or you’ll can find the same in Control Panel
Go to Manage 3D Settings
and after changing TAB
CHOOSE BRAVE in the drop-down menu
…Follow what’s on the pic:

Restart Brave and Check…



My experience tell me that there are only three points where the issue is generate,
but please, if you find something different let me know!!!

Happy to ear if it was useful
Alain



PS: .Last time I built a PC, I noted all the procedure on a slip of paper....
 .... I lost the piece of paper. No idea where I put it, so it took three months and many bangs on several walls…
—till I found the slip of paper .... inside my previous PC—


So - I decided to write it online so next time I will not go crazy again…
… and may be some other can benefit from my own painful experience


(QantoPurple: Amd 5600X, MSI B550, 32G @3200, MSI TRIO 2070s
Samsung 8000 4k 65" 120H + Samsung 32" )

(aWhitePC: Intel 8700K, Gigabyte Z390, 16G @3000, Gigabyte OC White 2070
Samsung 7000 4k 55" + Samsung 27")