Assuming you have 3 lines of text in a cell created by Alt + Enter to get
line feeds.
You can adjust line spacing within that cell by
format>cells>alignment>vertical>distributed.
Row height would be dragged to suit your needs.
Wrap text must be enabled.
To adjust row heights on all worksheets within a workbook, right-click on a
sheet tab and "Select all sheets"
Select all rows on the active sheet and adjust row height.
Will be done to all sheets in the group.
Gord Dibben MS Excel MVP