I am experiencing the following.

My hot bar window at the bottom of the screen in MCPE disappears when using a crafting table or a furnace hence this renders the. I come out of the game and reload the save file again and the hot bar is there. I have also had this issue when using the crafting table, when exiting the crafting menu:

• If you press on the three dots it makes the hotbar vanish
• if you click the cross whilst in the crafting menu to does not dissappear

if i click on chat sometimes the crafting menu is shown. I'm playing in a Single player survival mode.