Remove Themes on the left

Can I remove the "Themes" button on the left side of the page.

Timo6 Which button is this? It might be added by an extension. Could you share a screenshot?

I think he means the Tags-Link (it's called Themen in the german translation).

oh in this case you can use css or an extension..

with css is:

li.item-tags {
    display: none;
}