How better can I describe this gesture? [closed]

Solution 1:

A gesture of appeasement

Felix raised his hands, displaying open palms, to show that he did not mean it. That would help.

There is nothing wrong with your original sentence. If you want an alternative, maybe:

Felix raised his hands in a gesture of appeasement, to show that he did not mean it. That would help.

Felix raised his open palms in a gesture of appeasement. That would help.

Felix held up his open palms, signalling appeasement. That would help.