how to change gantt chart timeline to weeks/months

Hello, the default timeline in the Gantt Chart template is days/weeks, but I need to display this in weeks/months. I’ve seen other posts which suggest clicking on the “tasks tab” and then zoom in/out to adjust the timescale. I’m not sure what is meant by the “tasks tab” and how to do this. Can anyone help?

https://extensions.libreoffice.org/templates/gantt-chart-template