I'm using CCS version 10.3.1. The editor tab spacing appears to be broken / stuck at 4 spaces. My Displayed tab width setting is already set to 2. Is there somewhere else that I should be looking to change tab spacing?

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I'm using CCS version 10.3.1. The editor tab spacing appears to be broken / stuck at 4 spaces. My Displayed tab width setting is already set to 2. Is there somewhere else that I should be looking to change tab spacing?

Is there somewhere else that I should be looking to change tab spacing?
Look under C/C++ -> Editor -> Typing:

And also go to C/C++ -> Code Style -> Formatter:

And use Edit on the required formatter profile:

In the screen shot of your Preferences while you searched for "tab" the C/C++ settings were not shown in the search results. You need to select "Show advanced settings" at the bottom left of the preferences dialog to show the C/C++ settings.