Dunno but a quick check using chromium on openSUSE 15.0 against my TVH 4.2.6 seems to work OK, showing both horizontal and vertical scroll bars.
The EPG is different to the other pages, it always only shows a single page. But it should be scrollable and thus able to show everything.
I'd suggest the problem is more likely to be with the browser than with TVH. Have you tried a different browser on the device? Or chrome on a different device?
I suppose possibly there is some configuration option in chrome that might affect scrolling. I don't know much about chrome, but it might be worth checking.