Hi @codestylist,
To set up the footer columns, inside the Customizer go to Twentig Theme Options > Footer and set the Widgets Layout setting to Row. It will automatically display the widgets inside the same area (Customizer > Widgets) in a row layout.
For example, if you have 4 widgets in the Footer #1 area, they will automatically be displayed in 4 columns.
I hope the above is useful to you.
Have a nice day.
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Thank you so much @twentig, for your reply. I could manage it and it works. Thumbs up!