Fit your data to the column width using the Wrap text option.
- select a cell, a range of cells or the whole worksheet,
- open the Cell settings panel by
- tapping the
icon at the top toolbar, or
- tapping the
option in the pop-up menu and choosing the Cell menu item,
- swipe up to see more options and tap the Text format option.
- swipe up to see the Wrap text switcher and turn it on.
- return to the previous screen by tapping the
arrow on the left and сlose the cell settings panel by tapping the 
icon on the right.
If you change the column width, data wrapping adjusts automatically.
You can also select a cell/cell range, tap the Wrap option from the pop-up menu that appears. When data wrapping is enabled, the Unwrap option becomes available in this menu.