I have three questions:

Exactly which graphics card is installed here?
Can I install more than one GPU?
Does the MB also have its own onboard graphics card?

Then three monitors are possible on one graphics card each?

Thank you!

Question

I have three questions:

Exactly which graphics card is installed here? 
Can I install more than one GPU?
Does the MB also have its own onboard graphics card?

Then three monitors are possible on one graphics card each?

Thank you!

Answer

the mobo is the MSI Z490-A PRO
since it has an intel chip, the intel graphics can also be used.
outputs for this are available on the mainboard. 

2nd GPU is also no problem 

I can't answer the question of exactly what kind of graphics is installed. 

Based on the listed manufacturers on the Captiva page --> I would assume that it is a card from Palit. 
https://www.captiva-power.de/produkte/gaming-pc/g29ig-20v2

greetings

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Question about Captiva G29IG 20V2

I have three questions: Exactly which graphics card is installed here? Can I install more than one GPU? Does the MB also have its own onboard graphics card? Then three monitors are possible on one graphics card each? Thank you!