[Feat]: Need to set a max width for the slider.

[rjamesnw]

Is your feature request related to a problem? Please describe.
Creating menu item buttons in the slider of a Page Layout control causes buttons to stretch way too long.

Describe the solution you'd like
The slider should have a min & max width for larger or smaller screens, or the sizes just look bad.

Describe alternatives you've considered
Using a drawer instead for now. Might have also been possible to put columns in the slider, but not sure how well that works on mobile.