Your options are:
1. Freeze Panes
2. Freeze top row
3. Freeze first column
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Click "Freeze Top Row" to always show row 1.
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Click "Freeze First Column" to always show column A.
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To set which rows will freeze, highlight the row below which rows you want to freeze. In this example, by highlighting row 3, it will freeze rows 1 and 2.
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Click "Freeze Panes"
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Click "Freeze Panes"
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Click "Freeze Panes"
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You can now see which rows and columns are frozen based on the thicker lines.