I believe that you may be asking about inserting a table into your email to arrange rows of text or images. At this time, we are not able to insert tables into emails created in our third-generation editor as this can break the mobile-responsive layout. I'll be more than happy to submit your feedback to the right team since I can see how this can be useful for certain types of layouts. In the meantime, you could insert a five-column block, which may enable you to accomplish what you are looking to do. The only limitation is that you'd have to move each block independently and you would not be able to move groups of them together.
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