Menu is not displaying completely on tablets

Menu is not displaying completely on tablets

My website has 5 pages that should be visible at the top level. In the original template only a few showed up and there was "more" to get to the others. I used the HTML editor to allow more space for the menu and on the desktop all the menu choices are visible. On an Anddoid phone, a couple menu choices show and then there is "more" to get to the others which is fine.

The problem is on an iPad and on  a Kindle Fire . (I haven't tested other tablets.) Only a few menu choices show up and there isn't a "more" to get to the other choices. It is the same in both landscape and horizontal.

I also used the HTML editor to make my "logo" stretch across the whole page. It looks ok on a desktop. There is space for it on a tablet, but it cuts off about 2/3 of the way across the screen.