Unclickable area at edge of screen

I've returned to Storyline after a few years away and have hit a mystery. There seems to be an unclickable area at the bottom of my screen, which is a problem as I need that area for my forward button (I prefer not to use the player buttons).

Currently the forward icon is on the slide master and I've inserted a hotspot over this in the actual slide. The top part of this is clickable but not the bottom. The same happens with a shape.

Can anyone help? Thank you - it's good to be back!

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