By default size of macOS Terminal in Big Sur is 80 (Columns) x 24 (Rows), if you want to change this ratio, you can do that by following the below steps,
- Open Terminal App,
- Go to Terminal Menu: Terminal -> Preferences...
- Go to Profiles,
- Click on Window tab,
- Look for Window Size, change the values for Columns and Rows according to your requirement,
- As you close Preferences, you will see that changes are refected instantly.

✌️This will not make the size of the Terminal fixed, you can resize it by stretching the edges!
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