According to the support documentation on adding a table in the new editor https://support.atlassian.com/confluence-cloud/docs/add-formatting-to-your-page/#Addformattingtoyourpage-tables:
Anyone have a suggestion?
You can revile the <- -> resize button at the top right of the table while in edit mode. This will toggle between a wider - normal width table. If you do not see that maybe you could show a picture of what you do see?
I copy and paste by selecting the table and on windows CTRL-C CTRL-V again while in edit mode. If you are not editing the confluence page you will not be able to change anything, just comment.
Hope this helps...
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