Going for a island focused setting and I want to make sure the geography makes sense

I'm currently working on fantasy setting with a strong focus on sea based adventures. To try and make the setting clearly different from Earth I thought I make large landmasses virtually unheard of, with numerous small island being common instead.

Are there any rational ways I could explain why this is so besides the lazy "˜a wizard did it' excuse? Additionally is there any logical consequences I should be aware of in regards to weather and such on the islands?

On a final note, are there any features I could use to create natural or unnatural barriers to travel between different area of a vast global ocean?

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Going for a island focused setting and I want to make sure the geography makes sense

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