View Site As - not scrolling when access levels run off the page

When I click on "View site as:" in the top WP menubar, I get a drop down of all my Access Levels.

ITEM 1 - I have 40 access levels (so far) and I cannot access those that are below the bottom of the page - the drop down doesn't scroll so I can't get to them all.

ITEM 2 - Having selected an option - there doesn't seem to be any way to get back to my Admin view again - even if I log out.

Can you please help with these issues.

Many thanks - JC