Thank you for bringing this to our attention. I just want to make sure we're thinking of the same thing. If you're referring to tables inserted into a block, like so:
Then you are able to adjust the size of tables by adjusting the percentage or pixels.
If you are not referring to inserting tables in blocks then I will need some more information to better assist you. Are you referring to the blocks themselves (like a Content block or Image block, etc.)?