I'm testing the Worksheet beta for one of my clients and it does not accommodate wide tables. They have a table with about 350 columns and 80 rows, but the Worksheet does not display the table. It appears briefly then disappears. Support said that the feature does not support tables that wide and that I needed to reduce the number of columns to have it display. However, that is not my clients requirement, so the feature is not usable. I opened a ticket Case #05929051, and support recommended that I submit a post to the Idea Exchange.