Hi Joey1HM,
Thanks for the query and we are here to assist you on this.
If you want to translate an entire document, please refer to video starting from 1 min 18 second. It is quite old video and it may not apply to your latest Word on Windows 10, but general steps are similar. On the latest Word version on Monthly Channel,
we can click Review tab > Translate > select language after To in the translater Pane > click
OK to translate entire document.


Let us know if you have further queries with your Office version ( File > Account > Product Information) and some related screenshots.
Regards,
Tina