thank you. Do I have to have 600 gigs of space?! (I want pruned node)
If you don't enable pruning, you will have to keep the entire blockchain. The current size of blockchain is around 600 GB and it will grow over time.
When I tick, do I can change 2 gigs? For example, 10 gigs?
Yes, you can change the prune limit.
Again, if you run a pruned node, you will have to redownload the blockchain whenever you want to import a new wallet.