How to switch the capitals characters transform in DBeaver?

Got to Preferences > General > Editors > SQL Editor > SQL Formatting. Then over under Auto Format there is a box for Convert Keyword Case.

For DBeaver 6.2.4 I've found it in:

1. Window → Preferences → Database → Editors → SQL Editor → SQL Formatting / Keyword case option Keyword case option1

2. Window → Preferences → Database → Editors → SQL Editor → SQL Completion/ Convert keyword case option Keyword case option2

For DBeaver 7.0.2:

• Window → Preferences → DBeaver → Editors → SQL Editor → SQL Completion/ Convert keyword case option

My two cents, for Version 7.0.1.2:

• Preferences -> DBeaver -> Editors -> SQL Editor -> SQL Formating -> Keyword case

You can dictate this behaviour. Didn't test for older versions but it seems to be there for a while.