The line number on the SQL Editor in DBeaver

Window > Preferences > General > Editors > Text Editors Then, select the checkbox "Show Line Numbers"

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I found it:

Right click on left column of SQL Editor and click Show / Hide Line Numbers from context menu.

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In version 21.0.4.202105021514 it looks like this:

Windows > Preferences > Editors > Text Editors > Show line numbers

It is under Window / Preferences / Editors / Text Editors:

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In older versions it was under Window / Preferences / General / Editors / Text Editors.

But as @simhumileco pointed out, there is a shortcut in the context menu when you right-click the left gutter of the editor.

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