Square brackets are sugar syntax for slot content. You place new elements into them like in your example line #4. You could construct new element in place or preconstruct it somewhere else and later just inset it. You can think square brackets as “slots” where you insert stuff. If you need more functional Slate examples I would encourage you to browse Helium Rain Github repository as it is great learning example how to use Slate in game. If you are making editor tools then just fork Unreal from Github and look into it’s codebase. Nearly all Slate classes use prefix SSomeWidget…
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