Anke, as long as you are on the move tool (or other non brush tool) like Cassie suggests, you don't need to click into the blend mode box to change it, just try using the Shift +/-
I find that if I click into the box, then I get stuck in that move up/down but have to hit enter to have it actually change. If you don't click in there, it should just automatically begin shifting from mode to mode.
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