When I launch the grid editor I can't see the buttons at the bottom of the grid editor - have attached a pic - so can't make any changes and find it hard to get out of the editor. Any tips on how I can shrink it to fit my screen?

Most likely you have set the monitor to some size above 100%. You have to change it in the settings you find when right clicking on your screen.

I'm having the same problem. My display is set at 100 per cent. I'm not have such a problem with any other programme or other facets of site designer.
Thank you for considering this issue.
mds

Could ot be that your screen resolution is set very low? If so, try to set it to something higher.