Okay i am running SPV, atleast i think

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If you chose SPV (over Native) then you are running SPV

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So if i understand well i can park my coins in the wallet and close everything and even then i receive some interest.
Yes you can close the wallet. Your address will accrue
interest, but you have to claim it manually (you have a button for that) so that it's added to the balance of your address. If you want more
interest, you should claim frequently.