MAC OS High Sierra, Inbox: how do I go back to the top after doing a search in emails?

Hi,

When I am in my email box, I type a word in the "search"box to find any email.

When I find it, I click and open this message.

Then when I want to go back to the top of the inbox, I have to scroll the whole emails and sometimes this is a long way! I tried to refresh by clicking on the email button but nothing.

My question: how do I go back to the top of the emails inbox?

Thanks for your help,

Aude