I tried entering a reply (to thread) in mobile view - which is the default on my Jolla C - with both the Jolla browser and Firefox for Android. The Jolla browser’s vkb hides the reply box whereas Firefox doesn’t. It may not always do that but it repeatably did so for me.
You could experiment with desktop view (hamburger menu, top right); that seems to allow you to shift the reply pane up.
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