MS Excel
You can use the horizontal and vertical scroll bars to

View different rows and columns edit the contents of a cell
Split a worksheet into two panes
Edit the contents of a cell
View different worksheets

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MS Excel
You can auto fit the width of column by

Double clicking on column right border on column header
Double clicking on the column left border of column header
Double clicking on the column name on column header
Double click on the cell pointer in worksheet

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