Fitting buttons together

Apologies for what is probably a really basic question. I want to fill my slide with buttons which are all the same size and abut against each other so there is no background showing. Is there a quick way of doing this? I'm struggling with adjusting sizes, trying to get them to snap together (for some reason there are always some which want to have a gap or overlap their neighbour).

I'm sure there's a simple way, but can't figure it out.

Thanks

Ann

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