This question probably applies to Solidworks as a whole, but I most often encounter it when working with configurations.

If I select multiple assemblies/parts/mates, and then 'Configure Feature' I'm presented with an array of checkboxes. I've found that I can use the Tab key or Arrow keys to navigate around the checkboxes, and Delete to clear a checkbox.

What I can't find is any key which marks a checkbox. Surely there is a key for this? I think I've pressed every key on my keyboard, but haven't found it yet!

If anyone is able to point me in the right direction, I would be most grateful.