First of all, using table is becoming more and more a "taboo" since mobile platforms find it hard to bootstrap them even you are not setting fixed width and height.
If you have to use table, and you have to edit it, some basic HTML will help. The Canvas rich text editor does not give you all the options. For example:
To increase the width of certain column, you need to readjust the percentage of the width, the table below has an even 1/3 width, but you can set it to 40%, 30%, and 30% or any proportion you need.
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 33.3333%;"></td>
<td style="width: 33.3333%;"></td>
<td style="width: 33.3333%;"></td>
</tr>
<tr>
<td style="width: 33.3333%;"></td>
<td style="width: 33.3333%;"></td>
<td style="width: 33.3333%;"></td>
</tr>
</tbody>
</table>
To align text, you need to add in this CSS inline to the table style: vertical-align: top
<table style="border-collapse: collapse; width: 100%; vertical-align: top; " border="1">
Hope this helps. Again, avoid using tables, there are better ways to organize your content.
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