Currently, from the documentation These are Confluence's Table Capabilities:

• Insert an empty row above the current one.
• Insert an empty row below the current one.
• Remove the current row.
• Cut the current row and copy it to the clipboard.
• Copy the current row to the clipboard.
• Paste the row from the clipboard to the current row.
• Insert an empty column to the left of the current one.
• Insert an empty column to the right of the current one.
• Remove the current column.
• Merge the selected cells.
• Split the selected merged cells.
• Mark a row as a table header. The cells in the row will be highlighted in grey and the text will be bold.
• Mark a column as a table header. The cells in the column will be highlighted in grey and the text will be bold.
• Highlight cells with a background colour.
• Remove the table.

It's great if we are able to adjust the width or thickness of the table borders.