If you want to go straight to the Structure Board when you log in to JIRA, you can make it your JIRA Home page. To do so:

1. open the dropdown next to your user name in the top right of the page;
2. choose Structure in the My JIRA Home section.

When used as a JIRA Home page, the Structure Board will show your current structure, as if you clicked the top-level Structure menu.

You can also go to your JIRA Home at any time by clicking the JIRA logo in the top-left corner of any JIRA page.