Change resolution for stream but leave it normal?

Iv
- in Twitch
6

I have an older monitor (https://www.amazon.de/Fujitsu-B17-2-Zoll-Monitor-Reaktionszeit/dp/B000AMPY54) which is very impractical for Stream's. Since I recently bought my 1,800 euro PC, I have to save again for a gaming monitor. So my question is:

Is there a program or device that leaves my resolution on the screen, but on Twitch, YouTube etc. The "standard" resolution is displayed?

If so, which one is recommended? If possible 50 euro (+/- 20 euro)

Questions for by the way:

Since my setup (keyboard, mouse and monitor) is outdated anyway - they were all free ^^

The following additional questions:

Which gaming monitor can you recommend? (4K would be good)

Which gaming keyboard and mouse from Corsair can you recommend?

PS.: The keyboard should have this function, where if you press the key lightly that e.g. You know, the car drives slowly.

So

Keyboard: Mechanical with Cherry MX Speed (K95 e.g.)

Mouse: Glaiv Pro

Ay

As far as I know, unfortunately, but you can make rectangular light on the desktop and then in the picture setting there you can select your desired format for screen 1 16: 9 probably 1920x 1080

I'm assuming that the screen can't 4 k then you would unfortunately have black edges on the top / side

Ay

https://www.amazon.de/...076YYK6QV/

I guess you don't want to spend 500 euro on a screen

Tip: Please do not lay too many things on you 2 screens mouse EC. I have the experience that I paid about 2000 for my equip and after about 1 year I was very annoyed

Iv

4k is for the monitor I want to buy in the future

Ay

4 thousand? How much money do you hate XD please

It's more like prototypes!

Iv

I mean 4k resolution!

Stream Ps4? Yo Yoke6582