Note: the size of your device’s screen determines how many columns you see represented in a given view.
AppSheet doesn't let app creators manually set column sizes due to the wide variety of phone and tablet screen sizes. Instead we provide an option to control how wide the columns are.
While editing a view in the UX > Views tab, there is an option named Column width:
Column width has three settings:
Default: Columns will be automatically sized based on the size of the row content and column type.
Wide: Columns will be automatically sized but will be given some extra space. Use this option if you're having trouble with some columns being truncated.
Narrow: Columns will be automatically sized but will be smaller than they otherwise would be. Use this option to fit more columns onto small phone screens by truncating more text than normal.
Some other variables can affect column width: