Not in Premiere Elements.
Each Premiere Elements template has a maximum number of scene menu buttons. Once that maximum is met, a new menu page is automatically generated until all of the menu markers are represented.
Do you have Photoshop, or Photoshop Elements?
If you do, with some, very careful work, you can alter the Scene Selection Menus, but you will want to do so, only if you understand the conventions of a PrE Menu Set, and their structure. Also, if you do so, do NOT Save over the existing DVD Menu Set Templates, but in a separate folder. We can give you steps, but I strongly suggest that if one is not familiar with the structure and conventions, they spend some time studying the Menu Set Templates in PS, or PSE, until it's very clear what needs to be done.
Possible, but one needs that understanding first, and then they need to know their way around Photoshop/Photoshop Elements. I think that it is best to go with the design of the DVD Menu Set Templates, or perhaps stop by Muvipix.com, and see if they offer a Menu Set, that is more in keeping with what you want already. Those are very inexpensive, and are very nice.
Which Menu Set are you hoping to use?