Dimitrijs,

If you are using a datagrid, you can look in the Properties pane in the General section for column width settings.

If you are using datagrid 2, you set the column width in the properties of each column defined in datagrid 2.  For details on how datagrid 2 columns are sized, you can look at this documentation:  https://docs.mendix.com/appstore/modules/data-grid-2/#columns

In both types of grids, you set the width or width behavior, but not a minimum and maximum.

Hope that helps,

Mike