This visual page editor is part of the JBoss Tools plugin that you installed to be able to integrate and use the JBoss AS server in Eclipse .
You do not need it. These are not only experimental, but overall visual page editors simply do not work when you want to get high-quality code. Just click the red cross in the lower right, and then go to the Source tab and finally close the Palette tab. This is, fortunately, a one-time thing. When you create new JSP pages, it will stay away.

This is just the worst part of the particularly excellent JBoss Tools plugin.
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