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From screenshots I see, I can't see the whole thing.
I suggest you to check our wiki page on how to make GUIs with slots: https://mcreator.net/wiki/making-guis-slots If your GUI does not work after watching the tutorial, you might want to check our example workspace and build from there: https://mcreator.net/modification/42649/fusion-table-procedure-demo
You might want to open a forum topic for this too.