To create a table, use the 'insert table' icon

We do not recommend that you copy in tables, as you are also copying the underlying code.
If the code is included, the table may behave differently than you would expect - eg not respond responsively.

If you want to edit in a table, right-click on the table and select table properties

From here you can adjust the properties of the table, eg the width.

If you want to align a single cell, add rows or columns, right-click the appropriate location

From here you have the option to add what you want, or go to properties for the cell itself.