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tabu is no longer maintained. If that bothers you, it is better to use a different environment, such as tabularx .

Use the starred variant of the table environment to span the table across both columns.

Thanks Bartman,

I tried the following:

\begin{table*}[H]
table1...
\end{table*}

However ...

Hi,

I am using this template:

https://www.latextemplates.com/template/stylish-article

Could someone please kindly explain how I can make tables span two columns? I can't seem to get it to work properly with:

\begin{tabu} to \textwidth {XXXX}
\toprule
xx & 1 & 2 & 3 \\
\bottomrule
\end{tabu}