Change resolution on Windows 8 laptop?

Hello, I also use an old laptop on which I installed Windows 10. It was way too slow for me, so I switched back to Windows 8, it is now much faster. Now to my question: The resolution can't be changed in the system controls, everything is fully drawn out. How can I change that again?

Install the driver for the graphics chip from the manufacturer's website, then the best resolution should be set.

Where can i find it? Have the core i5 520m

What is the model name of the laptop?

Fujitsu lifebook e780

Take a look at this page: https://support.ts.fujitsu.com/IndexDownload.asp?lng=de

There you should be able to search for your model and download the drivers there