Make any world then press the multiplayer button Tap to place blocks. Hold to break blocks. Click the 3 dots to open the inventory. To use most blocks click on them then click the 3 dots. To save or chat click save and commands. To eat click the screen when holding the food. To get out of the any inventory click the 3 dots again.
I changed the costumes such as operation buttons. You can play on mobile or PC. Maybe you can't play multiplayer mode.