I made a sample repo here: https://github.com/codychaplin/UraniumUI_TitleFontSize. In 2.9.1 this worked, but this occurs in all versions as of 2.10.0. Basically the TitleFontSize property of the InputField not longer responds to changes, I think the title might have been changed to a control template in 2.10 so that may be part of the issue? My sample includes 3 input fields, 2 of which bind directly to a TitleFontSize property in my VM, and the other is a dynamic resource, none of which update when changing the slider value, then there's a regular label and button which update fine. If you downgrade the package to 2.9.1 everything works.

I found a similar issue which may have the same root cause and documented it here: https://github.com/enisn/UraniumUI/discussions/881.

Note: I have only tested this on Android and iOS.