Lr mobile, tablet: Colour features missing in portrait mode

Hello - direct me to appropriate group if needed.

Using my tablet (Kindle Fire) with Lr mobile recent update - in the Color module in portrait orientation - sometimes the "B&W - Grading - Mix" are not visible. They are always visible in landscape orientation but not always for portrait.

If I turn my tablet landscape and then back to portrait, those features have usually reappeared.

Anyone else?

It has not happened in a couple days now, maybe a tablet reboot helped.