why not use min-column-width attribute where you can set the minimum column width for the table and you will get the scroller along x-axis which you can use to scroll through rest of the rows

  <lightning-datatable
                key-field="id"
                data={data}
                columns={columns}
                min-column-width="100"
                >
        </lightning-datatable>

it will look something like this https://developer.salesforce.com/docs/component-library/tools/playground

why not use min-column-width attribute where you can set the minimum column width for the table and you will get the scroller along x-axis which you can use to scroll through rest of the columns

  <lightning-datatable
                key-field="id"
                data={data}
                columns={columns}
                min-column-width="100"
                >
        </lightning-datatable>

it will look something like this https://developer.salesforce.com/docs/component-library/tools/playground/6PhM9grWA/1/edit