So...
When I open the game, the system doesn't freeze any more. That's better 
But when I use Shift+TAB to close the steam panel, it freezes a bit and doesn't close. When I'm lowering/raising the sound it freezes again.
Is it a KDE issue, a Steam issue or something else? 
Try a different kernel.
Could you please say why should I try a different one? I don't want to mess my system 
it shouldn't mess up your system. If you try a kernel and your system doesn't like it, you can easily switch back.
As far as "why"? Changing kernels to troubleshoot issues is pretty common.
I see you're on kernel 5.6.16. Try an older kernel, such as 5.5 or 5.4. Usually requires a reboot. More than likely the kernel is not the issue, but it is a good troubleshooting step to get out of the way.
By the way, what is the package name and version of Steam you are running?
Hard to say. I don't have it on my KDE install, but each system and games behave differently with different hardware components.
For starters, you have only 8GB RAM, which is not too much. I have also 8GB and it's OK for the most time, but I configured dynamic swap file and my SSD memory is relatively fast, so it can expand if needed, plus my RAM is also fast.
Secondly, your CPU is i5 but relatively new generation, so this looks fine.
Your GPU can do some gaming but it's not awesome for gaming. So it simply may come down to the fact that both RAM and GPU are struggling with some quick changes when it comes to switching windows. As to the freezes during volume change, this sound like a bug of some sort.
Since you have hybrid graphics, how did you configure it?
Show me output of:
mhwd -li
Are you sure your Nvidia is working when you are playing the game? Maybe Intel is doing the work as CPU and GPU and it's been struggling, hence the issues?
If you open Steam and dgo to Help->System Information, what does it say under Graphical Card, Driver?
I'm running steam-native 1.0.0.62-2
By the way, I found a package called linux-steam-integration in Pamac. What does it do?
Thanks. I'll try them
EDIT: Which one?
So... I don't think it's a hardware issue because I never faced this 
[xicomaia@xicomaia-manjaro ~]$ mhwd -li
> Installed PCI configs:
--------------------------------------------------------------------------------
NAME VERSION FREEDRIVER TYPE
--------------------------------------------------------------------------------
video-hybrid-intel-nvidia-440xx-prime 2019.10.25 false PCI
Warning: No installed USB configs!
Informações do computador:
Fabricante: Unknown
Modelo: Unknown
Tipo: Portátil
Sem input táctil
Informação do processador:
Fabricante do CPU: GenuineIntel
Marca do CPU: Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
Família do CPU: 0x6
Modelo do CPU: 0x8e
Versão do CPU: 0xa
Tipo do CPU: 0x0
Velocidade: 1600 Mhz
8 processadores lógicos
4 processadores físicos
HyperThreading: Suportado
FCMOV: Suportado
SSE2: Suportado
SSE3: Suportado
SSSE3: Suportado
SSE4a: Não suportado
SSE41: Suportado
SSE42: Suportado
AES: Suportado
AVX: Suportado
AVX2: Não suportado
AVX512F: Não suportado
AVX512PF: Não suportado
AVX512ER: Não suportado
AVX512CD: Não suportado
AVX512VNNI: Não suportado
SHA: Não suportado
CMPXCHG16B: Suportado
LAHF/SAHF: Suportado
PrefetchW: Não suportado
Versão do Sistema Operativo:
"Manjaro Linux" (64 bits)
Nome do Kernel: Linux
Versão do Kernel: 5.6.16-1-MANJARO
Editora de Servidor X: The X.Org Foundation
Versão de Servidor X: 12008000
Gestor de janelas X: KWin
Versão Runtime do Steam: <Runtime disabled>
Placa gráfica:
Driver: NVIDIA Corporation GeForce MX130/PCIe/SSE2
Versão do driver: 4.6.0 NVIDIA 440.82
Versão do OpenGL: 4.6
Profundidade de cor do ambiente de trabalho: 24 bits/pixel
Taxa de Atualização do Monitor: 59 Hz
Código do fabricante: 0x10de
Código do dispositivo: 0x174d
Revisão não detetada
Número de monitores: 1
Número de placas gráficas lógicas: 1
Resolução do monitor principal: 1366 x 768
Resolução do ambiente de trabalho: 1366 x 768
Tamanho do monitor principal: 13.54" x 7.64" (15.51" diag)
34.4cm x 19.4cm (39.4cm diag)
Bus principal: PCI Express 4x
VRAM principal: 2048 MB
Modos MSAA suportados: 2x 4x 8x 16x
Placa de som:
Dispositivo de áudio: Realtek ALC255
Memória:
RAM: 7837 Mb
Hardware de R.V.:
Headset de R.V.: Nenhum encontrado
Diversos:
Idioma da interface: Português (Portugal)
Idioma: pt_PT.UTF-8
Espaço total disponível em disco: 112967 Mb
Maior bloco livre no disco rígido: 46569 Mb
If you need translation, just say
Thank you very much to both for your help.
Anything strange on that I posted? 
I think there is a Steam-Manjaro package, I don't have my machine available to look right now to verify if that is the correct package name, but I'm finding that on the forum. I would suggest installing that.
Kernels, I would give 5.4.44-1 a try. If it doesn't work, you can easily switch back or try other kernels.
Well... Thank you
Manjaro come preinstalled with Steam-Manjaro and I installed Steam-native, to see if it would improve.
About kernels, I'll try later 
I do not know why, but I think Steam-Manjaro was created for compatibility reasons. Please try that
EDIT: I found it. This was the first post to get the community to test the Steam-Mnajaro package.
EDIT2: Make sure to reset Steam with command line steam --reset this way it will act as a fresh install.
Thanks again
I have both installed, should I remove steam-native?
And what about linux-steam-integration?
You can have both installed. steam-native is optional and linux-steam-integration enhances it's abilities. I have all three installed. That way native libraries are being used instead of the older Steam Runtime libraries. However, sometimes that can cause issues. If so, you can uninstall the latter two.
Thank you
I'll install the package and see if it improves
Well... 
Well, what? Read the descriptions.
Steam native is not Steam per see, let me quote arch wiki:
The
steam-nativescript launches Steam with theSTEAM_RUNTIME=0environment variable making it ignore its runtime and only use system libraries.
I use steam-native myself and so far it worked well for me, but it is possible that it could cause issues with some games. On other hand, since the system libs are newer, it could also improve some games. So it could be positive or negative, but for the most part it works well.
Anyway, it looks like your driver setup is correct and nvidia is working, so it's hard to pin point what is causing the issue. Like I said, every hardware and software setup is different so you need to experiment and maybe you find solution, but since those issues aren't universal (most people don't have them on those games), we can't give any simple solution, only various suggestions.
Thanks anyway
You can go through journald, kernel, DM, kernel, xorg logs and look for time stamps where the freezes occurred. Maybe there is a hint there what is happening. Plasma has a nice log utility where you can see the most important ones.
Ideally, you could watch in real time processes and I/O when doing switching or changing volume, but I don't think is possible since it freezes everything or am I wrong? Hmmm...
It freezes for about 10secs
This sounds like CPU spike, but what is causing it? Maybe you find a way to observe it somehow.
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