Desktop and mobile settings
Mobile is configured separately, not scaled. How to set it and what to check before publishing.
Mobile sizes are their own controls
Sizes are not scaled down automatically from desktop. Each element that has a size has a separate mobile size, so you set what the phone should actually show.
This matters most for headlines. A 64px headline that looks right on desktop wraps into four lines on a phone unless you set the mobile size explicitly.
Check the mobile preview
The settings modal has a Mobile tab beside Desktop. It applies the same mobile treatment the published page will use, so what you see there is what a phone gets.
Pointer effects on touch screens
Magnetic Button and Spotlight Button follow the cursor, and a touch screen has no cursor to follow. Both fall back to their own mobile treatment rather than sitting inert, but the effect is a desktop enhancement by nature. Do not rely on it to make the button legible.
Did this not cover it? Ask support.