How do I add 'trigger once' condition to an OR block?

So, I need to add 'trigger once' condition to an OR block but this doesn't seem to be possible...? The trigger once is created as an OR condition (see pic) which immediatly triggers regardless of the other conditions in the block.

Is there a way around this?

Thanks!

make it as sub event

The Keyboard's IsDown event will always trigger while the key is pressed. Maybe you can try Keyboard OnKeyPressed instead; which triggers only once when the key is pressed.

Thank you both!